- Author: Robert Schleicher
- Language: English
- Year: 2011
- Author: Robert Schleicher James R. Barr
- Language: English
- Year: 1988
- Author: Robert Schleicher James R. Barr
- Language: English
- Year: 1980
- Author: Robert Schleicher Harold A. Edmonson
- Language: English
- Year: 1976
- Author: Robert Schleicher
- Language: English
- Year: 2009