- Author: Spencer Robert
- Language: English
- Year: 2007
- Author: Spencer Robert
- Language: English
- Year: 2006
- Author: Spencer Robert
- Language: English
- Year: 2006
- Author: Spencer Robert
- Language: English
- Year: 2012
- Author: Spencer Robert
- Language: English
- Year: 2012
- Author: Spencer Robert
- Language: English
- Year: 2021
- Author: Spencer Robert
- Language: English
- Year: 2005
- Author: Ali Daniel, Spencer Robert
- Language: English
- Year: 2011
- Author: Spencer Robert
- Language: Spanish
- Year: 2007
- Author: Spencer Robert
- Language: English
- Year: 2005