De Bono's Thinking Course, Revised Edition
Lateral Thinking: Creativity Step by Step
The 5-Day Course in Thinking
Teach Yourself How To Think
Practical Thinking: 4 Ways to be Right; 5 Ways to be Wrong; 5 Ways to Understand
Edward de Bono's Textbook of Wisdom
How to Have a Beautiful Mind
Six Frames: For Thinking About Information
Six Thinking Hats
The Six Value Medals: The Essential Tool for Success in the 21st Century