See BookDesignPatterns for additional information.

Common name for the authors (Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides) of the book:

Design Patterns:Elements of Reusable Object-Oriented Software

Addison Wesley ISBN:0-201-63361-2

http://www.aw-bc.com/catalog/academic/product/0,1144,0201633612,00.html