- Author: Eileen Crist
- Language: English
- Year: 2000
- Author: Arluke Arnold
- Language: English
- Year: 2006
- Author: Arnold Arluke
- Language: English
- Year: 1996
- Author: Eileen Crist
- Language: English
- Year: 1999
The Two-in-One
pdf
- Author: Rod Michalko
- Language: English
- Year: 1998
- Author: Leslie Irvine
- Language: English
- Year: 2004
- Author: Eileen Crist
- Language: English
- Year: 2000
- Author: Marc Bekoff
- Language: English
- Year: 2006
- Author: Arnold Arluke
- Language: English
- Year: 2006
- Author: Arnold Arluke
- Language: English
- Year: 2006