APA (7th ed.) Citation

Tolle, E. (2005). The Power of Now: A Guide to Spiritual Enlightenment. New World Library.

Chicago Style (17th ed.) Citation

Tolle, Eckhart. The Power of Now: A Guide to Spiritual Enlightenment. Calif: New World Library, 2005.

MLA (9th ed.) Citation

Tolle, Eckhart. The Power of Now: A Guide to Spiritual Enlightenment. New World Library, 2005.