Further Reading

C# Design Patterns: A Tutorial, Chapter 4, by James W. Cooper , Addison Wesley. ISBN: 0201844532.

C# for Experienced Programmers, Chapter 5, by H. M. Deitel , et al, Prentice Hall. ISBN: 0130461334.

UML Distilled: A Brief Guide to the Standard Object Modeling Language, Third Edition by Martin Fowler, Addison-Wesley Professional. ISBN: 0321193687.