- Author: Gerhard Biller, Stefan Jenschke, Herma Kliege-Biller, Stefan Lorenz, Stephan Meier-Oeser, Heinrich Schepers, Martin Schneider
- Language: German
- Year: 2014
- Author: Gerhard Biller, Stefan Jenschke, Herma Kliege-Biller, Stefan Lorenz, Stephan Meier-Oeser, Heinrich Schepers, Martin Schneider
- Language: German
- Year: 2014