- Author: Douglas S Kurtz Charles W Swartz
- Language: English
- Year: 2011
- Author: Douglas S Kurtz Charles W Swartz
- Language: English
- Year: 2012
- Author: Douglas S Kurtz Charles W Swartz
- Language: English
- Year: 2011
- Author: Douglas S. Kurtz Charles W. Swartz
- Language: English
- Year: 2012
- Author: Douglas S. Kurtz Charles W. Swartz
- Language: English
- Year: 2012
- Author: Douglas S Kurtz Charles W. Swartz
- Language: English
- Year: 2008
- Author: Douglas S Kurtz Charles W. Swartz
- Language: English
- Year: 2004
- Author: Douglas S Kurtz Charles W. Swartz
- Language: English
- Year: 2004