- Author: Gregory Leland
- Language: English
- Year: 2004
- Author: Wendy Northcutt
- Language: English
- Year: 2010
- Author: Wendy Northcutt
- Language: English
- Year: 2008
- Author: Wendy Northcutt
- Language: English
- Year: 2006
- Author: Northcutt Wendy
- Language: English
- Year: 2003