- Author: Sadowski Dieter, Backes-Gellner Uschi
- Language: German
- Year: 1990
- Author: Backes-Gellner Uschi, Moog Petra
- Language: German
- Year: 2004
- Author: Backes-Gellner Uschi, Schmidtke Corinna
- Language: German
- Year: 2002
- Author: Backes-Gellner Uschi, Schmidtke Corinna
- Language: German
- Year: 2003