Cita APA (7a ed.)

Wellbeloved, S. (2003). Gurdjieff: The key concepts. Routledge.

Cita Chicago Style (17a ed.)

Wellbeloved, Sophia. Gurdjieff: The Key Concepts. London ; New York: Routledge, 2003.

Cita MLA (8a ed.)

Wellbeloved, Sophia. Gurdjieff: The Key Concepts. Routledge, 2003.