Links for Law of Demeter, including link to @erikdietrich 's post

Author: arialdomartini

design-patterns/law-of-demeter.md

@@ -1,9 +1,15 @@
 # Law of Demeter
 
-## [Krzysztof Grzybek](https://github.com/krzysztof-grzybek)
+* [Law of Demeter - Wikipedia](https://en.wikipedia.org/wiki/Law_of_Demeter)
+* [Law of Demeter - WikiWikiWeb](https://wiki.c2.com/?LawOfDemeter)
+* [Introducing Demeter and its Laws](http://www.bradapp.net/docs/demeter-intro.html)
 
+## Mnemonic for the Law of Demeter
+The post [Visualization Mnemonics for Software Principles](http://www.daedtech.com/visualization-mnemonics-for-software-principles) by [Erik Dietrich](https://github.com/erikdietrich) provides a very effective trick to understand (and never forget anymore) what the Law of Demeter is. An Italian translation is available [here](https://github.com/arialdomartini/mnemonics/blob/law-of-demeter/README-italian.md).
+
+## Code Example
+An example of code violating the Law of Demeter is provided by [Krzysztof Grzybek](https://github.com/krzysztof-grzybek)
 
-Code violating The Law of Demeter:
 ```javascript
 class Plane {
     constructor(crew) {
@@ -27,6 +33,7 @@ class Pilot {
     }
 }
 ```
+
 It's bad, because it creates tight coupling between objects - they are dependent on internal structure of other objects.
 
 Fixed code:
@@ -46,4 +53,3 @@ class Crew {
         return this.pilot.getName();
     }
 }
-