diff --git a/README.md b/README.md
index a918c80..1e77797 100644
--- a/README.md
+++ b/README.md
@@ -19,7 +19,7 @@ It is supplementary to my book titled **Design Patterns In Python** (ASIN : B08X
 
 ## Course Access
 
-There are 4 possible ways to access the video content in this course,
+There are 3 possible ways to access the video content in this course,
 
 1. Udemy : [https://www.udemy.com/course/design-patterns-in-python/?referralCode=7493DBBBF97FF2B0D24D](https://www.udemy.com/course/design-patterns-in-python/?referralCode=7493DBBBF97FF2B0D24D)
    - Get **Udemy Discount Coupons** at [https://sbcode.net/coupons](https://sbcode.net/coupons)
@@ -27,10 +27,7 @@ There are 4 possible ways to access the video content in this course,
    - 30 Day Money Back Guarantee
 2. YouTube Membership : [https://www.youtube.com/channel/UCmUILI2AWt2MSUgPlZwFdOg/join](https://www.youtube.com/channel/UCmUILI2AWt2MSUgPlZwFdOg/join)
    - Cancel Membership Anytime
-3. Skillshare : [https://skl.sh/34SM2Xg](https://skl.sh/34SM2Xg)
-   - Certificate of Completion
-   - Cancel Subscription Anytime
-4. Book : [https://www.amazon.com/dp/B08XLJ8Z2J](https://www.amazon.com/dp/B08XLJ8Z2J) : ASIN B08XLJ8Z2J
+3. Book : [https://amzn.to/466lBN6](https://amzn.to/466lBN6) : ASIN B08XLJ8Z2J
    - **Book** includes FREE Video Access Codes to view videos from the official documentation website at [https://sbcode.net/python/](https://sbcode.net/python/)
 
 All the code examples in the book can be found in these pages.
@@ -49,10 +46,6 @@ All the code examples in the book can be found in these pages.
 
 ---
 
-**Note**
-
-> If you just want to read my design pattern articles, and you don't need to access the videos, then you can read them via [Medium Membership](https://sean-bradley.medium.com/membership)
-
 ## Overview
 
 A Design Pattern is a description or template that can be repeatedly applied to a commonly recurring problem in software design.
@@ -92,8 +85,8 @@ So, in this book, you will learn about these 23 Design Patterns,
 
 ## Pattern Types
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Class Scope and Object Scope Patterns
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
diff --git a/abstract_factory/README.md b/abstract_factory/README.md
index 69d18d8..fe3f1c5 100644
--- a/abstract_factory/README.md
+++ b/abstract_factory/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Abstract Factory UML Diagram
 
@@ -36,7 +36,7 @@ python ./abstract_factory/abstract_factory_concept.py
 
 ## Abstract Factory Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Abstract Factory Example UML Diagram
 
@@ -117,4 +117,4 @@ Python Errors and Exceptions : [https://docs.python.org/3/tutorial/errors.html](
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/adapter/README.md b/adapter/README.md
index d977bd2..36a5311 100644
--- a/adapter/README.md
+++ b/adapter/README.md
@@ -17,11 +17,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Adapter UML Diagram
 
@@ -29,7 +29,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -43,7 +43,7 @@ method B
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -143,4 +143,4 @@ When executing [/adapter/cube_a.py](/adapter/cube_a.py) you will notice that the
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/bridge/README.md b/bridge/README.md
index e47e5ab..21be331 100644
--- a/bridge/README.md
+++ b/bridge/README.md
@@ -17,11 +17,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Bridge UML Diagram
 
@@ -29,7 +29,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -43,7 +43,7 @@ c
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -121,4 +121,4 @@ PS> python
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/builder/README.md b/builder/README.md
index fb2f7bf..1016ae9 100644
--- a/builder/README.md
+++ b/builder/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Builder UML Diagram
 
@@ -28,7 +28,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -39,7 +39,7 @@ python ./builder/builder_concept.py
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -113,4 +113,4 @@ This line, creates a list at runtime including the strings 'SmallChair', 'Medium
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/chain_of_responsibility/README.md b/chain_of_responsibility/README.md
index 3fa4a4b..23537c5 100644
--- a/chain_of_responsibility/README.md
+++ b/chain_of_responsibility/README.md
@@ -17,11 +17,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Chain of Responsibility UML Diagram
 
@@ -29,7 +29,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -47,7 +47,7 @@ Finished result = -1.5
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -111,4 +111,4 @@ See PEP-3111 : [https://www.python.org/dev/peps/pep-3111/](https://www.python.or
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/command/README.md b/command/README.md
index 5920c95..9835591 100644
--- a/command/README.md
+++ b/command/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Command Pattern UML Diagram
 
@@ -28,7 +28,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -42,7 +42,7 @@ Executing Command 2
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -78,4 +78,4 @@ It is just a useful construct that you will see developers use as a recommendati
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/composite/README.md b/composite/README.md
index 37d5e84..7a9f7b0 100644
--- a/composite/README.md
+++ b/composite/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Composite UML Diagram
 
@@ -28,7 +28,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -48,7 +48,7 @@ COMPOSITE_2     id:2050574298128
 
 ## Composite Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Composite Example UML Diagram
 
@@ -124,4 +124,4 @@ Visit [https://docs.python.org/3/reference/expressions.html#conditional-expressi
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/decorator/README.md b/decorator/README.md
index 6d74631..31c7f86 100644
--- a/decorator/README.md
+++ b/decorator/README.md
@@ -17,11 +17,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Builder UML Diagram
 
@@ -37,7 +37,7 @@ Decorator Method(Component Method)
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -133,4 +133,4 @@ The `__str__` dunder was also overridden in the [/prototype/prototype_concept.py
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/facade/README.md b/facade/README.md
index dfa62ef..242a2d6 100644
--- a/facade/README.md
+++ b/facade/README.md
@@ -17,7 +17,7 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Facade UML Diagram
 
@@ -37,7 +37,7 @@ B
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -170,4 +170,4 @@ Found 2 errors in 2 files (checked 1 source file)
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/factory/README.md b/factory/README.md
index d1dd8fc..4a6f2b9 100644
--- a/factory/README.md
+++ b/factory/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Factory UML Diagram
 
@@ -28,7 +28,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -39,7 +39,7 @@ ConcreteProductB
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Factory Example UML Diagram
 
@@ -93,4 +93,4 @@ See PEP 3119 : [https://www.python.org/dev/peps/pep-3119/](https://www.python.or
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/flyweight/README.md b/flyweight/README.md
index 170c137..e0fbbc2 100644
--- a/flyweight/README.md
+++ b/flyweight/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Flyweight UML Diagram
 
@@ -28,7 +28,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -41,7 +41,7 @@ FlyweightFactory has 5 flyweights
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -86,4 +86,4 @@ eg,
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/interpreter/README.md b/interpreter/README.md
index bac547f..c49e7d8 100644
--- a/interpreter/README.md
+++ b/interpreter/README.md
@@ -17,11 +17,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Interpreter UML Diagram
 
@@ -29,7 +29,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -43,7 +43,7 @@ python ./interpreter/interpreter_concept.py
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ![Abstract Syntax Tree Example](/img/interpreter_ast_roman_numeral.svg)
 
@@ -171,4 +171,4 @@ Outputs
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/iterator/README.md b/iterator/README.md
index be63322..c995307 100644
--- a/iterator/README.md
+++ b/iterator/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Iterator UML Diagram
 
@@ -28,7 +28,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -42,7 +42,7 @@ This method has been invoked
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -118,4 +118,4 @@ Also note that the list being printed at the end is automatically filled from th
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/mediator/README.md b/mediator/README.md
index 3f7b3a0..c62667a 100644
--- a/mediator/README.md
+++ b/mediator/README.md
@@ -15,11 +15,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Mediator UML Diagram
 
@@ -27,7 +27,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -39,7 +39,7 @@ COLLEAGUE2 <--> Here is the Colleague1 specific data you asked for
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -62,4 +62,4 @@ Component1: <<< In <<< : data C
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/memento/README.md b/memento/README.md
index 922eba6..98e5fe7 100644
--- a/memento/README.md
+++ b/memento/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Memento UML Diagram
 
@@ -28,7 +28,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ### Output
 
@@ -53,7 +53,7 @@ State #3
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -151,4 +151,4 @@ print(example.value) # now raises an AttributeError
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/observer/README.md b/observer/README.md
index 2744223..1965ab3 100644
--- a/observer/README.md
+++ b/observer/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Observer UML Diagram
 
@@ -28,7 +28,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -41,7 +41,7 @@ Observer id:2084220160272 received ('Second Notification', {'A': 1, 'B': 2, 'C':
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -88,4 +88,4 @@ Note, if instantiating an empty **Set** then use `my_object = Set()` rather than
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/prototype/README.md b/prototype/README.md
index 4b49386..0b69ff8 100644
--- a/prototype/README.md
+++ b/prototype/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Prototype UML Diagram
 
@@ -28,8 +28,8 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/proxy/README.md b/proxy/README.md
index aa62785..64456cf 100644
--- a/proxy/README.md
+++ b/proxy/README.md
@@ -17,11 +17,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Proxy UML Diagram
 
@@ -40,7 +40,7 @@ pulling data from Proxy cache
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -101,4 +101,4 @@ See the [Lion](/proxy/lion.py), [Serpent](/proxy/serpent.py) and [Leopard](/prox
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/singleton/README.md b/singleton/README.md
index c59e0b8..c2cebd3 100644
--- a/singleton/README.md
+++ b/singleton/README.md
@@ -16,7 +16,7 @@ Cover | Links |
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Singleton UML Diagram
 
@@ -32,11 +32,11 @@ id(OBJECT2)     = 2164775087968
 id(OBJECT3)     = 2164775087968
 ```
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Example UML Diagram
 
@@ -133,4 +133,4 @@ PS> python
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/state/README.md b/state/README.md
index 90dd505..4f1fce5 100644
--- a/state/README.md
+++ b/state/README.md
@@ -16,11 +16,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## State UML Diagram
 
@@ -28,7 +28,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ### Output
 
@@ -43,7 +43,7 @@ I am ConcreteStateC
 
 ## State Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## State Example Use Case UML Diagram
 
@@ -92,4 +92,4 @@ EXAMPLE() # function now gets called by default
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/strategy/README.md b/strategy/README.md
index 41d0205..8f1a389 100644
--- a/strategy/README.md
+++ b/strategy/README.md
@@ -15,11 +15,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Strategy UML Diagram
 
@@ -27,7 +27,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -40,7 +40,7 @@ I am ConcreteStrategyC
 
 ## Strategy Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Strategy Example Use Case UML Diagram
 
@@ -57,4 +57,4 @@ I am Crawling. New position = [3.5, 0]
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/template/README.md b/template/README.md
index dc1736c..fe00545 100644
--- a/template/README.md
+++ b/template/README.md
@@ -15,11 +15,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Template Method UML Diagram
 
@@ -27,7 +27,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output 
 
@@ -42,7 +42,7 @@ Class_B : Step Three. (overridden)
 
 ## Template Method Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Template Method Use Case UML Diagram
 
@@ -76,4 +76,4 @@ footer  : -- Page 1 --
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file
diff --git a/visitor/README.md b/visitor/README.md
index 0c7cf82..1f969de 100644
--- a/visitor/README.md
+++ b/visitor/README.md
@@ -17,11 +17,11 @@ Cover | Links
 
 ## Overview
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Terminology
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Visitor UML Diagram
 
@@ -29,7 +29,7 @@ _... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lecture
 
 ## Source Code
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Output
 
@@ -44,7 +44,7 @@ A
 
 ## Visitor Example Use Case
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
 
 ## Visitor Example UML Diagram
 
@@ -141,4 +141,4 @@ jklmn     1011
 
 ## Summary
 
-_... Refer to [Book](https://www.amazon.com/dp/B08Z282SBC), pause [Video Lectures](#videos) or subscribe to [Medium Membership](https://sean-bradley.medium.com/membership) to read textual content._
\ No newline at end of file
+_... Refer to [Book](https://amzn.to/466lBN6) or [Design Patterns In Python website](https://sbcode.net/python/) to read textual content._
\ No newline at end of file