Agile Principles, Patterns, and Practices in C#

[GOF95] Erich Gamma, Richard Helm, Ralph Johnson, and John Vlissides, Design Patterns: Elements of Reusable Object-Oriented Software, Addison-Wesley, 1995.

[PLOPD3] Robert C. Martin, Dirk Riehle, and Frank Buschmann, eds. Pattern Languages of Program Design 3, Addison-Wesley, 1998.