APA (7th ed.) Citation

Rosenthal, A. K., & Lichtenheld, T. (2007). The OK book. HarperCollins.

Chicago Style (17th ed.) Citation

Rosenthal, Amy Krouse, and Tom Lichtenheld. The OK Book. New York: HarperCollins, 2007.

MLA (8th ed.) Citation

Rosenthal, Amy Krouse, and Tom Lichtenheld. The OK Book. HarperCollins, 2007.

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