- Author: Martina Winkhart-Martis, Rüdiger Martis
- Language: German
- Year: 2009
- Author: Rüdiger Martis, Martina Winkhart-Martis
- Language: German
- Year: 2014
- Author: Rüdiger Martis, Martina Winkhart-Martis
- Language: German
- Year: 2017
- Author: Rüdiger Martis, Martina Winkhart-Martis
- Language: German
- Year: 2021