Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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