- Author: Haverkamp Rita
- Language: German
- Year: 2011
- Author: Harder Manfred
- Language: German
- Year: 1968
- Author: Gössel Karl Heinz
- Language: German
- Year: 1974
- Author: Emad Parvis, Herrmann Friedrich-Wilhelm von, Maly Kenneth, Fédier François, Coriando Paola-Ludovika
- Language: German
- Year: 2002
- Author: Elm Kaspar, Parisse Michel
- Language: German
- Year: 1992
- Author: Ehlers Dirk
- Language: German
- Year: 1986
- Author: Dietze Gottfried
- Language: German
- Year: 1992