
- Author: Smith Julie
- Language: English
- Year: 2016

- Author: Seiffert Johannes
- Language: German
- Year: 2014

- Author: Müller Wolfgang, Welsh Louise
- Language: German
- Year: 2016

- Author: Lens Conny
- Language: German
- Year: 2000

- Author: Graf Roger
- Language: German
- Year: 2001

- Author: Graf Roger
- Language: German
- Year: 2000

- Author: Higgins Clark Mary, Julius Liselotte
- Language: German
- Year: 2016

- Author: John Paul Athanasourelis
- Language: English
- Year: 2012