- Author: Robin Usher (auth.)
- Language: English
- Year: 2012
- Author: David Scott, Robin Usher
- Year: 2011
- Author: David Scott, Robin Usher
- Language: English
- Year: 1999
- Author: David Scott, Robin Usher
- Language: English
- Year: 1999
- Author: Robin Usher Richard Edwards (auth.)
- Language: English
- Year: 2007
- Author: David Scott, Robin Usher
- Language: English
- Year: 2000
- Author: David Scott Robin Usher
- Language: English
- Year: 2011
- Author: David Scott, Robin Usher
- Language: English
- Year: 1996
- Author: David Scott, Robin Usher
- Language: English
- Year: 1996
- Author: Robin Usher Richard Edwards
- Language: English
- Year: 2007