- Author: P. Dirr (editor)
- Language: German
- Year: 1925
- Author: Michael Dirr
- Language: English
- Year: 2019
- Author: Dirr Michael A
- Language: English
- Year: 2011
- Author: Dirr Michael A
- Language: English
- Year: 2017
- Author: Michael Dirr, Keith S Warren
- Language: English
- Year: 2019
- Author: Claudia Kocian-Dirr
- Language: German
- Year: 2019
- Author: Michael A. Dirr
- Language: English
- Year: 2011
- Author: Dirr A.
- Language: Armenian-German