- Author: Jesper Tang Nielsen
- Language: German
- Year: 2009
- Author: Don B. Garlington
- Language: English
- Year: 1991
- Author: Chris Keith (editor) Loren T. Stuckenbruck (editor)
- Language: English
- Year: 2016
- Author: Hanna Stettler
- Language: German
- Year: 1998
- Author: Michael J. Morris
- Language: English
- Year: 2017
- Author: Thomas Tops
- Language: English
- Year: 2022