
- Author: Carl Ritter
- Language: German
- Year: 1941

- Author: Moriz Ritter
- Language: German
- Year: 1918

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

- Author: Ulrich Peter Ritter, Jens Hohmeier, Thomas Plaßmann
- Language: German
- Year: 1999

- Author: Hellmut Ritter
- Language: German
- Year: 1916

- Author: Gerhard A. Ritter
- Language: German
- Year: 2010

- Author: Friedrich Kaulbach (editor), Joachim Ritter (editor)
- Language: German
- Year: 1966

- Author: Ferdinand Werne (editor), Carl Ritter (editor)
- Language: German
- Year: 1848

- Author: P. F. Stuhr (editor), Friedrich Heinrich Hugo Windischmann (editor), Herrmann Joseph Schmitt (editor), Heinrich Ritter (editor)
- Language: German
- Year: 1835