- Author: Karen A. Foss, Sonja K. Foss, Robert Trapp
- Language: English
- Year: 2002
- Author: Stephen W. Littlejohn, Karen A. Foss, John G. Oetzel
- Language: English
- Year: 2016
- Author: Dr. Stephen Littlejohn Karen A. Foss
- Language: English
- Year: 2009
- Author: Stephen W. (Stephen W. Littlejohn) Littlejohn Karen A. Foss
- Language: English
- Year: 2007