- Author: Alexander Ro?nagel Silke Jandt Jurgen Muller Andreas Gutscher Jessica Heesen
- Language: German
- Year: 2006
- Author: Ernest Nagel James R. Newman
- Language: Italian
- Year: 1992
- Author: Ann Ferguson Mechthild Nagel
- Language: English
- Year: 2009
- Author: Ernest Nagel James R. Newman
- Language: Spanish
- Year: 2007
- Author: Robert F. Nagel
- Language: English
- Year: 1996
- Author: Christian Nagel Bill Evjen Jay Glynn Karli Watson Morgan Skinner
- Language: English
- Year: 2010
