- Author: Vollmer Uwe
- Language: German
- Year: 2007
- Author: Semler Eva Verena
- Language: German
- Year: 2013
- Author: Hellwege Phillip
- Language: German
- Year: 2005
- Author: Mendelssohn Moses
- Language: German
- Year: 2013
- Author: Norberto Bobbio, Lydia G. Cochrane
- Language: English
- Year: 2014
- Author: George P. Schmidt
- Language: English
- Year: 2019