Cita APA (7a ed.)

Daniels, D. N., & Price, V. A. (2009). The essential enneagram: The definitive personality test and self-discovery guide (Revised and updated.). HarperOne.

Cita Chicago Style (17a ed.)

Daniels, David N., y Virginia Ann Price. The Essential Enneagram: The Definitive Personality Test and Self-discovery Guide. Revised and updated. New York: HarperOne, 2009.

Cita MLA (8a ed.)

Daniels, David N., y Virginia Ann Price. The Essential Enneagram: The Definitive Personality Test and Self-discovery Guide. Revised and updated. HarperOne, 2009.

Precaución: Estas citas no son 100% exactas.