Margaret Caroline Anderson
- Wikipedia's biography of her life.
- http://en.wikipedia.org/wiki/Margaret_Caroline_Anderson

Jeanne de Salzmann
- Wikipedia's biography of her life.
- http://en.wikipedia.org/wiki/Jeanne_de_Salzmann

Jean Toomer
- Wikipedia's biography of his life.
- http://en.wikipedia.org/wiki/Jean_Toomer

René Daumal
- Wikipedia's biography of his life.
- http://en.wikipedia.org/wiki/Rene_Daumal

Thomas and Olga de Hartmann
- Wikipedia's very short biography of the Thomas and Olga de Hartmann
- http://en.wikipedia.org/wiki/Thomas_and_Olga_de_Hartmann

Alfred Richard Orage
- Wikipedia's biography of his life.
- http://en.wikipedia.org/wiki/Alfred_Richard_Orage

John G. Bennett
- Wikipedia's biography of his life.
- http://en.wikipedia.org/wiki/John_G._Bennett

Fritz Peters
- Dedicated to Fritz Peters (1913-1979), he is most well known for his memoirs covering his early years living at G. I. Gurdjieff's Institute for the Harmonious Development of Man.
- http://www.fritzpeters.info/

Anderson, Margaret C.
- Archives finding aid. Letters, photos and manuscripts.
- http://www.uwm.edu/Library/arch/findaids/uwmmss12.htm

The Thomas de Hartmann Papers
- Documents de Hartmann's life and work through musical sketches, manuscript scores, and printed music and contains materials relating to G.I. Gurdjieff.
- http://webtext.library.yale.edu/xml2html/music/ht-d.htm