- Author: Peter Ullrich
- Language: English
- Year: 2023
- Author: Reinhold Remmert Peter Ullrich (auth.)
- Language: German
- Year: 2008
- Author: Britta Baumgarten Priska Daphi Peter Ullrich (eds.)
- Language: English
- Year: 2014
- Author: Karl Weierstraß (auth.) Dr. Peter Ullrich (eds.)
- Language: German
- Year: 1988
- Author: Prof. Dr. Reinhold Remmert Dr. Peter Ullrich (auth.)
- Language: German
- Year: 1987
- Author: Florian Hessdörfer Andrea Pabst Peter Ullrich
- Language: English
- Year: 2010
- Author: Reinhold Remmert Peter Ullrich
- Language: German
- Year: 2008
- Author: Reinhold Remmert Peter Ullrich
- Language: English
- Year: 2008
- Author: Reinhold Remmert Peter Ullrich
- Language: German
- Year: 1995