- Author: Stephen J. Wellum, Brent E. Parker
- Language: English
- Year: 2016
- Author: Peter J. Gentry, Stephen J. Wellum
- Language: English
- Year: 2018
- Author: Peter J. Gentry, Stephen J. Wellum
- Language: English
- Year: 2015
- Author: Stephen J. Wellum John S. Feinberg
- Language: English
- Year: 2016