- Author: Franz Bockrath
- Language: English
- Year: 2023
- Author: Franz Bockrath
- Language: English
- Year: 2023
- Author: Franz Bockrath (editor)
- Language: German
- Year: 2014
- Author: Franz Bockrath
- Language: German
- Year: 2014
- Author: Franz Bockrath (editor), Bernhard Boschert (editor), Elk Franke (editor)
- Language: German
- Year: 2015