The Enneagram and Human Types Extract from "In Search of the Miraculous" by P. D. Ouspensky discussing the Enneagram, and a summary of the idea of Human Types using the Enneagram. http://www.promart.com/9gram.html

Tone Constellations of the Enneagram, a key to the inner hexagram This brief outline attempts to survey what is already known about its construction, and to introduce a new viewpoint that can expand our appreciation of this symbol. http://gate.cruzio.com/~e0yes/properties/

The Enneagram and Process Short essay on the Enneagram with a personal example of a process. http://www.geocities.com/Athens/Agora/3199/process.html

4thway Books Books relating to the Fourthway. Gurdjieff, Ouspensky, Bennett, Nicoll etc. http://4thway.com