- Author: Coray Marina Krieter-Spiro Martha
- Language: German
- Year: 2021
- Author: Coray Marina Krieter-Spiro Martha
- Language: German
- Year: 2021
- Author: Krieter-Spiro Martha
- Language: English
- Year: 2018
- Author: Krieter-Spiro Martha
- Language: English
- Year: 2015
- Author: Krieter-Spiro Martha
- Language: English
- Year: 2015