APA (7th ed.) Citation

Lamb, W. (2008). I know this much is true. Harper Perennial.

Chicago Style (17th ed.) Citation

Lamb, Wally. I Know This Much Is True. New York: Harper Perennial, 2008.

MLA (9th ed.) Citation

Lamb, Wally. I Know This Much Is True. Harper Perennial, 2008.