- Author: Hans-Edwin Friedrich, Barbara Potthast
- Language: German
- Year: 2015
- Author: Barbara Potthast
- Language: Spanish, Castilian
- Year: 2010
- Author: Barbara Potthast (editor), Karl Kohut (editor), Gerd Kohlhepp (editor)
- Language: Spanish, Castilian
- Year: 2019
- Author: Christine Hatzky, Barbara Potthast
- Language: German
- Year: 2021
- Author: Christine Hatzky, Barbara Potthast
- Language: German
- Year: 2021