- Author: Hans Schemann
- Language: German
- Year: 2011
- Author: Hans Schemann, Renate Birkenhauer
- Language: German
- Year: 2012
- Author: Hans Schemann
- Language: English
- Year: 1997
- Author: Hans Schemann
- Language: English
- Year: 1996
- Author: Hans Schemann
- Language: German
- Year: 2011
- Author: Hans Schemann
- Language: German
- Year: 1992