- Author: Kenneth Blanchard, Thad Lacinak, Chuck Tompkins, Jim Ballard
- Language: English
- Year: 2003
- Author: Kenneth Blanchard, Spencer Johnson
- Language: English
- Year: 1999
- Author: Klaus Kenneth Blanchard
- Language: English
- Author: Kenneth Blanchard Spencer Johnson
- Language: German
- Year: 2002
- Author: Ph.D. Kenneth Blanchard M.D. Spencer Johnson
- Language: English
- Year: 1983