- Author: Barry Ketley
- Language: Spanish
- Year: 2001
- Author: Barry Ketley Mark Rolfe
- Language: English
- Year: 1999
- Author: Barry Ketley
- Language: Spanish
- Year: 2001
- Author: Barry Ketley Mark Rolfe
- Language: German
- Year: 2000
- Author: Barry Ketley
- Language: English
- Year: 2010
- Author: Jeffrey J. Thomas & Barry Ketley
- Language: English
- Year: 2003
- Author: Barry Ketley Mark Rolfe
- Language: English
- Year: 2001
- Author: Barry Ketley Mark Rolfe
- Language: English
- Year: 1996
- Author: Barry Ketley Mark Rolfe
- Language: English
- Year: 1999
- Author: Barry Ketley
- Language: English
- Year: 1999