APA (7th ed.) Citation

Winfrey, O. (2014). What I Know For Sure. Macmillan.

Chicago Style (17th ed.) Citation

Winfrey, Oprah. What I Know For Sure. UK: Macmillan, 2014.

MLA (9th ed.) Citation

Winfrey, Oprah. What I Know For Sure. Macmillan, 2014.

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