APA (7th ed.) Citation

HEY. (2006). The 9 dimensions of the soul: Essence and the enneagram. O Books,.

Chicago Style (17th ed.) Citation

HEY. The 9 Dimensions of the Soul: Essence and the Enneagram. Winchester, U.K., Washington, U.S.A:: O Books,, 2006.

MLA (9th ed.) Citation

HEY. The 9 Dimensions of the Soul: Essence and the Enneagram. O Books,, 2006.