- Author: Gray Geoffrey, Gray Geoffrey G., Munro Doug, Winter Christine
- Language: English
- Year: 2012
- Author: Gray Geoffrey
- Language: English
- Year: 2011
- Author: Gray Geoffrey
- Language: English
- Year: 2011
- Author: Cooper D. B., Gray Geoffrey, Cooper D. B
- Language: English
- Year: 2011
- Author: Colin S. Gray Geoffrey Sloan
- Language: English
- Year: 1999