- Author: Robert Kirchubel Howard Gerrard
- Language: English
- Year: 2005
- Author: Robert Kirchubel Howard Gerrard
- Language: English
- Year: 2003
- Author: Robert Kirchubel Howard Gerrard
- Language: English
- Year: 2003
- Author: Robert Kirchubel Howard Gerrard
- Language: English
- Year: 2003
- Author: Robert Kirchubel Howard Gerrard
- Language: Spanish
- Year: 2007
- Author: Robert Kirchubel Howard Gerrard P. Dennis
- Language: Spanish
- Year: 2007
- Author: Robert Kirchubel Howard Gerrard
- Language: English
- Author: Robert Kirchubel Howard Gerrard
- Language: English