References
Books By G.I.Gurdjieff
“Remember you come here having already understood the necessity of struggling with yourself — only with yourself. Therefore thank everyone who gives you the opportunity.”
― G.I. Gurdjieff

Beelzebub's Tales to His Grandson: All and Everything

Meetings With Remarkable Men : All and Everything Second Series

Life is Real Only Then, When 'I Am': All and Everything Third Series

The Herald of Coming Good: First appeal to contemporary Humanity
Books By P. D. Ouspensky
Ouspensky met Gurdjieff in Moscow in 1915, and was associated with the ideas and practices originating with Gurdjieff from then on.

In Search of the Miraculous: The Definitive Exploration of G. I. Gurdjieff's Mystical Thought and Universal View

The Psychology of Man's Possible Evolution

The Fourth Way: Teachings of G.I. Gurdjieff

Tertium Organum: a key to the enigmas of the world
Other Books
The Reality of Being
Author: Jeanne de Salzmann
Our life with Mr. Gurdjieff
Author: Thomas De Hartman
My childhood with Gurdjieff
Author: Fritz Peters
The Theory of Celestial Influences
Author: Rodney Collin
Gurdjieff, a very big enigma
Author: John Bennet
Psychological Commentaries On The Teaching Of G. I. Gurdjieff And P. D. Ouspensky
Author:Maurice Nicoll
The symbolism of the Gospel of John
Author: Ravi Ravindra.