- Author: Burkard Polster, Marty Ross
- Language: English
- Year: 2017
- Author: David Greenwood et al.
- Language: English
- Year: 2015
- Author: Wolfgang Schwarz
- Language: German
- Year: 2018
- Author: Fintan Culwin
- Language: English
- Year: 1997
- Author: John Stillwell
- Language: English
- Year: 2018
- Author: Regina Möller Rose Vogel
- Language: German
- Year: 2018
- Author: Paul Jainta et al.
- Language: German
- Year: 2018
- Author: Erhard Cramer Johanna Nešlehová
- Language: German
- Year: 2018
- Author: Gerard Weisbuch
- Language: English
- Year: 1991