TOP #3
TOP #8

Design Patterns: Elements of Reusable Object-Oriented Software

Erich Gamma, Richard Helm, Ralph Johnson, John Vlissides
TOP #10
TOP #11

Refactoring: Improving the Design of Existing Code

Martin Fowler, Kent Beck, John Brant, William Opdyke, Don Roberts
TOP #13

Head First Design Patterns: A Brain-Friendly Guide

Eric Freeman, Bert Bates, Kathy Sierra, Elisabeth Robson
TOP #17
TOP #19