Cita APA (7a ed.)

Tolle, E., & McDonnell, P. (2009). Guardians of being. New World Library.

Cita Chicago Style (17a ed.)

Tolle, Eckhart, y Patrick McDonnell. Guardians of Being. Novato, Calif.: New World Library, 2009.

Cita MLA (8a ed.)

Tolle, Eckhart, y Patrick McDonnell. Guardians of Being. New World Library, 2009.

Precaución: Estas citas no son 100% exactas.