- Author: Wittman Robert K., Shiffman John
- Language: English
- Year: 2010
- Author: Wittman Robert K
- Language: English
- Year: 2010
- Author: Wittman Robert K
- Language: English
- Year: 2010
- Author: Robert K. Wittman, John Shiffman
- Language: English
- Year: 2010
- Author: Wittman Robert K., Shiffman John
- Language: English
- Year: 2010
- Author: White Trena, Knelman Joshua
- Language: English
- Year: 2011