- Author: Robert W. Berger
- Language: English
- Year: 1969
- Author: Robert W. Berger
- Language: English
- Year: 1990
- Author: Robert E. Berger
- Language: English
- Year: 2014
- Author: Robert E. Berger
- Language: English
- Year: 2014
- Author: Robert W. Berger
- Language: English
- Year: 1997
- Author: Robert J. Berger
- Language: English
- Year: 1985