- Author: Ekirch A. R., Ekirch A. Roger
- Language: English
- Year: 2006
- Author: Vogel Nela
- Language: German
- Year: 2015
- Author: Schaper Marlies, Wittler Tine
- Language: German
- Year: 2016
- Author: Held Ursula, Mata Julie
- Language: German
- Year: 2015
- Author: Dahlke Ruediger
- Language: German
- Year: 2014
- Author: Brand Christine
- Language: German
- Year: 2018
- Author: Bischoff Ursula, Morley Charlie
- Language: German
- Year: 2015
- Author: Fischer Helene, Lerchenfeldt Conrad
- Language: German
- Year: 2019