- Author: Erik Ritter von Kuehnelt-Leddihn
- Language: English
- Year: 2012
- Author: Erik Ritter von Kuehnelt-Leddihn
- Language: English
- Year: 2012
- Author: Ritter Constantin (A. Alles transl.)
- Language: English
- Year: 1933
- Author: Carl RITTER
- Language: English
- Year: 2012
- Author: Anselm Ritter
- Language: German
- Year: 2008
- Author: Joachim R. R. Ritter Ulrich R. Christensen
- Language: English
- Year: 2007
- Author: Joachim Ritter
- Language: English
- Year: 1984
- Author: Erik Ritter von Kuehnelt-Leddihn (under pseudonym Francis Stuart Campbell)
- Language: English
- Year: 2007
