- Author: Edwin K. Broadhead
- Language: English
- Year: 2010
- Author: Marc Philonenko
- Language: German
- Year: 2002
- Author: Gerhard Ebeling
- Language: German
- Year: 1975
- Author: Loren T. Stuckenbruck
- Language: English
- Year: 1995
- Author: Daniel R. Schwartz
- Language: English
- Year: 1992