- Author: Hermann Paul, Thomas Klein, Hans-Joachim Solms, Klaus-Peter Wegera, Ingeborg Schöbler, Heinz-Peter Prell
- Language: German
- Year: 2007
- Author: Thomas Klein, Hans-Joachim Solms, Klaus-Peter Wegera
- Language: German
- Year: 2017
- Author: Thomas Klein Hans-Joachim Solms Klaus-Peter Wegera
- Language: German
- Year: 2009
- Author: Thomas Klein Hans-Joachim Solms Klaus-Peter Wegera
- Language: German
- Year: 2018