- Author: Snowdon Christopher
- Language: English
- Year: 2009
- Author: Droemer., Spitzer Manfred
- Language: German
- Year: 2015
- Author: Bartens Werner
- Language: German
- Year: 2016
- Author: Grimm Hans-Ulrich
- Language: German
- Year: 2015
- Author: DePalma Anthony
- Language: English
- Year: 2011