- Author: Moritz Schlick
- Language: Romanian
- Year: 2003
- Author: Zig Ziglar
- Language: English
- Year: 1982
- Author: Shirley Harrison
- Language: English
- Year: 2011
- Author: Walter Biemel
- Language: Romanian
- Year: 2004
- Author: Paul A. Baran Paul M. Sweezy
- Language: French
- Year: 1973
- Author: Muriel Gardiner - Editor
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- Year: 1973
- Author: Gunnar Myrdal
- Language: English
- Year: 1971
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- Language: English
- Year: 1996
- Author: Edward De Bono
- Language: English
- Year: 1990
- Author: Brian Jackson Dennis Marsden
- Language: English
- Year: 1962