- Author: Marc Marschark Patricia Elizabeth Spencer
- Language: English
- Year: 2010
- Author: Marc Marschark Patricia Elizabeth Spencer
- Language: English
- Year: 2016
- Author: Patricia Elizabeth Spencer, Marc Marschark
- Language: English
- Year: 2006
- Author: Marc Marschark Patricia Elizabeth Spencer (Editors)
- Language: English
- Year: 2003