- Author: Walter J. Spielberger Uwe Feist
- Language: English
- Year: 1968
- Author: Walter J. Spielberger Uwe Feist
- Language: English
- Year: 1970
- Author: Walter J. Spielberger Uwe Feist
- Language: English
- Year: 1968
- Author: Walter J. Spielberger Uwe Feist
- Language: English
- Year: 1967
- Author: Walter J. Spielberger Uwe Feist
- Language: English
- Year: 1968