
- Author: Gerhard Ritter
- Language: English
- Year: 2023

- Author: Gerhard Ritter
- Language: English
- Year: 2023

- Author: Gerhard Ritter
- Language: German
- Year: 1948

- Author: Gerhard Ritter
- Language: German
- Year: 1940

- Author: Gerhard Ritter
- Language: German
- Year: 1970

- Author: Gerhard Ritter R. T. Clark
- Language: English
- Year: 2015

- Author: Gerhard Ritter
- Language: English
- Year: 1969

- Author: Gerhard Ritter, Peter Paret (ed.)
- Language: English
- Year: 1968