- Author: Brigitte Groneberg
- Language: German
- Year: 2004
- Author: Brigitte Groneberg (editor) Hermann Spieckermann (editor)
- Language: German, English
- Year: 2007
- Author: Brigitte Groneberg
- Language: German
- Year: 1982
- Author: Brigitte Groneberg Hermann Spieckermann
- Language: German
- Year: 2007