- Author: Stäheli Urs
- Language: English
- Year: 2013
- Author: Nelson Julie A
- Language: English
- Year: 2006
- Author: Foster Gigi, Frijters Paul
- Language: English
- Year: 2013
- Author: Frank Robert H
- Language: English
- Year: 2015
- Author: Vinzenz von Holle (auth.)
- Language: German
- Year: 2018