- Author: Walter Nicholson, Christopher M. Snyder
- Language: English
- Year: 2016
- Author: Walter Nicholson Christopher M. Snyder
- Language: English
- Year: 2011
- Author: Walter Nicholson Christopher M. Snyder
- Language: English
- Year: 2009
- Author: Walter Nicholson Christopher M. Snyder
- Language: English
- Year: 2008