- Author: Welsch Ulrich, Sobotta Johannes
- Language: Spanish, German
- Year: 2008
- Author: Deller Thomas, Kummer Wolfgang, Welsch Ulrich
- Language: German
- Year: 2018
- Author: Storch Volker, Welsch Ulrich, Kükenthal Willy Georg
- Language: German
- Year: 2009
- Author: Welsch Ulrich, Sobotta Johannes
- Language: German
- Year: 2006