- Author: Snyder Carolyn
- Language: English
- Year: 2003
- Author: Snyder Carolyn
- Language: English
- Year: 2003
- Author: Xerox Corporation. Palo Alto Research Center, Hiltzik Michael A
- Language: English
- Year: 2009
- Author: Xerox Corporation. Palo Alto Research Center, Hiltzik Michael A
- Language: English
- Year: 2009