- Author: Wales Prinz Charles, Gressmann Andreas, Lohmann Sabine, Mayer Catherine, Prummer-Lehmair Christa, Steckhan Barbara
- Language: German
- Year: 2015
- Author: Prince of Wales Charles, Mayer Catherine
- Language: English
- Year: 2015
- Author: Prince of Wales Charles, Mayer Catherine
- Language: English
- Year: 2016
- Author: Prince of Wales Charles, Mayer Catherine
- Language: English
- Year: 2016