- Author: Ulrich Raulff, Karl Christ
- Language: German
- Year: 2006
- Author: Karl Christ
- Language: German
- Year: 2016
- Author: Meister Eckhart, Albert Zimmermann Loris Sturlese Karl Christ
- Language: Latin, German
- Year: 1994
- Author: Karl Christ
- Language: German
- Year: 2006
- Author: Karl Christ
- Language: German
- Year: 2006
- Author: Karl Christ
- Language: German
- Year: 1991
- Author: Karl Christ
- Language: German
- Year: 1991
- Author: Karl Christ
- Language: German
- Year: 2001