APA (7th ed.) Citation

Winfrey, O. (2015). O's little guide to finding your true purpose (First [edition].). Flatiron.

Chicago Style (17th ed.) Citation

Winfrey, Oprah. O's Little Guide to Finding Your True Purpose. First [edition]. New York: Flatiron, 2015.

MLA (8th ed.) Citation

Winfrey, Oprah. O's Little Guide to Finding Your True Purpose. First [edition]. Flatiron, 2015.

Warning: These citations may not always be 100% accurate.