removed duplicate links and reworded as needed (mbeaudru#70)

Author: martypowell

README.md

@@ -1061,7 +1061,7 @@ highlight`I like ${condiment} on ${meal}.`;
 // "I like <mark>jam</mark> on <mark>toast</mark>."
 ```
 
-A more interesting example: 
+A more interesting example:
 ```js
 function comma(strings, ...values) {
   return strings.reduce((prev, next) => {
@@ -1211,11 +1211,7 @@ JavaScript is a [prototype-based](https://en.wikipedia.org/wiki/Prototype-based_
 
 The word *class* is indeed error prone if you are familiar with classes in other languages. If you do, avoid assuming how JavaScript classes work on this basis and consider it an entirely different notion.
 
-Since this document is not an attempt to teach you the language from the ground up, I will believe you know what prototypes are and how they behave. But here are some links I found great to understand this notion:
-
-- [Understanding Prototypes in JS - Yehuda Katz](http://yehudakatz.com/2011/08/12/understanding-prototypes-in-javascript/)
-- [A plain English guide to JS prototypes - Sebastian Porto](http://sporto.github.io/blog/2013/02/22/a-plain-english-guide-to-javascript-prototypes/)
-- [Inheritance and the prototype chain - MDN](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Inheritance_and_the_prototype_chain)
+Since this document is not an attempt to teach you the language from the ground up, I will believe you know what prototypes are and how they behave. If you do not, see the external resouces listed below the sample code.
 
 #### Samples