MLA

Nicoll, Maurice. Psychological Commentaries On the Teaching of Gurdjieff & Ouspensky. 1st Shambhala ed. London: Shambhala, 1984.

APA

Nicoll, M. (1984). Psychological commentaries on the teaching of Gurdjieff & Ouspensky. 1st Shambhala ed. London: Shambhala.

Chicago

Nicoll, Maurice, Psychological Commentaries On the Teaching of Gurdjieff & Ouspensky. 1st Shambhala ed. London: Shambhala, 1984.