
- Author: Nagel R. (ed.)
- Language: English
- Year: 2002

- Author: William Nagel
- Language: English
- Year: 2005

- Author: Christian Nagel
- Language: English
- Year: 2005

- Author: Christian Nagel Bill Evjen Jay Glynn Karli Watson Morgan Skinner
- Language: English
- Year: 2007