- Author: Martina Kittler
- Language: German
- Year: 2016
- Author: Martina Kittler
- Language: German
- Year: 2017
- Author: Martina Kittler, Barbara Klein
- Language: German
- Year: 2016
- Author: Martina Kittler
- Language: German
- Year: 2015
- Author: Martina Kittler
- Language: German
- Year: 2008