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The Enneagram : A Lecture by Gurdjieff
The Enneagram, Symbol of All and Everything by Nathan Bernier
Perspectives on Beelzebub's Tales by Keith Buzzell
The Intelligent Enneagram by Anthony Blake
The Enneagram by J.G. Bennett
Enneagram Studies by J.G. Bennett
In Search of the Miraculous by P.D. Ouspensky
The Fourth Way by P.D. Ouspensky
The Endless Search © 2004 Ian C. MacFarlane