- Author: Andrew Wroe, Jon Herbert, Jason Ralph, Robert Singh, Jonathan Parker
- Language: English
- Year: 2009
- Author: Robert Singh
- Language: English
- Year: 2012
- Author: Mary Buckley, Robert Singh
- Language: English
- Year: 2006
- Author: Robert Singh
- Language: English
- Year: 1997
- Author: Robert Singh
- Language: English
- Year: 2003
- Author: Mary Buckley Robert Singh
- Language: English
- Year: 2006