- Author: Gordon Williamson (Author) Ronald Volstad (Illustrator)
- Language: Spanish
- Author: Gordon Williamson, Ian Palmer(Illustrator)
- Language: English
- Year: 2009
- Author: Gordon Williamson
- Language: English
- Year: 2007
- Author: Gordon Williamson, Ian Palmer(Illustrator)
- Language: English
- Year: 2009
- Author: Gordon Williamson(Illustrations), Ian Palmer(Illustrations)
- Language: English
- Year: 2003
- Author: Gordon Williamson, Darko Pavlović(Illustrations)
- Language: English
- Year: 2002
- Author: Gordon Williamson, Stephen Andrew(Illustrations)
- Language: English
- Year: 2003
- Author: Gordon Williamson, Mike Chappell(Illustrator)
- Language: English
- Year: 2009
- Author: Gordon Williamson, Mike Chappell(Illustrator)
- Language: English
- Year: 2009
- Author: Gordon Williamson, Ian Palmer(Illustrator), Howard Gerrard(Illustrator)
- Language: English
- Year: 2011