- Author: Naika Foroutan, Christian Geulen, Susanne Illmer, Klaus Vogel, Susanne Wernsing
- Language: German
- Year: 2018
- Author: Christian Geulen (editor), Anne von der Heiden (editor), Burkhard Liebsch (editor)
- Language: German
- Year: 2002
- Author: Christian Geulen
- Language: Spanish
- Year: 2010