- Author: Klaus Düwel, Robert Nedoma, Sigmund Oehrl
- Language: German
- Year: 2020
- Author: Sigmund Oehrl
- Language: German
- Year: 2010
- Author: Wilhelm Heizmann (editor), Sigmund Oehrl (editor)
- Language: German
- Year: 2015
- Author: Wilhelm Heizmann (editor), Sigmund Oehrl (editor)
- Language: German
- Year: 2015
- Author: Klaus Düwel, Robert Nedoma, Sigmund Oehrl
- Language: German
- Year: 2020
- Author: Sigmund Oehrl
- Language: German
- Author: Wilhelm Heizmann Sigmund Oehrl (Hrsg.)
- Language: German
- Year: 2015
- Author: Sigmund Oehrl
- Language: German
- Year: 2010