- Author: Paul Foster
- Language: English
- Year: 2009
- Author: Doyle William
- Language: English
- Year: 2001
- Author: Stephen Aron
- Language: English
- Year: 2014
- Author: William Doyle
- Language: English
- Year: 2001
- Author: English Richard
- Language: English
- Year: 2013
- Author: Stephen Aron
- Language: English
- Year: 2014
- Author: Singer Peter
- Language: English
- Year: 2000
- Author: English Richard
- Language: English
- Year: 2013
- Author: Marshall Peter
- Language: English
- Year: 2009
- Author: Peter Singer
- Language: English
- Year: 2000
