- Author: William Gropp, Ewing Lusk, Anthony Skjellum, Holger Blaar, Paul Molitor
- Language: German
- Year: 2007
- Author: William Gropp Ewing Lusk Anthony Skjellum
- Language: English
- Year: 2014
- Author: William Gropp Ewing Lusk Anthony Skjellum
- Language: English
- Year: 1999