- Author: Geissler Theo, Zimmermann Olaf
- Language: German
- Year: 2007
- Author: Stefanie Ernst (ed.)
- Language: German
- Year: 2010
- Author: Fuchs Max, Zimmermann Olaf
- Language: German
- Year: 2008
- Author: Zimmermann Olaf
- Language: German
- Year: 2012
- Author: Geissler Theo, Zimmermann Olaf
- Language: German
- Year: 2015
- Author: Zimmermann Olaf
- Language: German
- Year: 2013
- Author: Schulz Gabriele, Zimmermann Olaf
- Language: German
- Year: 2010
- Author: Schulz Gabriele, Ries Carolin, Zimmermann Olaf
- Language: German
- Year: 2016
- Author: Olaf Zimmermann
- Language: German
- Year: 2008