- Author: David Chisholm, Steven P. Sondrup
- Language: German
- Year: 1986
- Author: Steven P. Sondrup, Randall L. Jones
- Language: German
- Year: 1989
- Author: David Chisholm, Steven P. Sondrup
- Language: German
- Year: 1982
- Author: Steven P. Sondrup
- Language: English
- Year: 2004
- Author: Steven P. Sondrup
- Language: English
- Year: 2004