Added reference for Service Layer.

iluwatar · iluwatar · commit b28c387b40f0 · 2015-04-15T23:00:32.000+03:00
diff --git a/README.md b/README.md
@@ -566,7 +566,7 @@ While the implementations look similar there are differences. The Chain of Respo
 * [TutorialsPoint - Intercepting Filter](http://www.tutorialspoint.com/design_pattern/intercepting_filter_pattern.htm)
 * [Presentation Tier Patterns](http://www.javagyan.com/tutorials/corej2eepatterns/presentation-tier-patterns)
 * [Functional Programming in Java: Harnessing the Power of Java 8 Lambda Expressions](http://www.amazon.com/Functional-Programming-Java-Harnessing-Expressions/dp/1937785467/ref=sr_1_1)
-
+* [Martin Fowler - Service Layer](http://martinfowler.com/eaaCatalog/serviceLayer.html)
 
 
 
