- Author: Elizabeth Vandiver, Ralph Keen, Thomas D. Frazel
- Language: English
- Year: 2010
- Author: Thomas D. Frazel
- Language: German
- Year: 2009
- Author: Elizabeth Vandiver Ralph Keen Thomas D. Frazel
- Language: English
- Year: 2002
- Author: Elizabeth Vandiver Ralph Keen Thomas D. Frazel
- Language: English
- Year: 2002
- Author: Elizabeth Vandiver Ralph Keen Thomas D. Frazel
- Language: German
- Year: 2002