APA (7th ed.) Citation

Kyle, DeFelice, & McEwen. (2012). American sniper: The autobiography of the most lethal sniper in U.S. military history. Harper.

Chicago Style (17th ed.) Citation

Kyle, DeFelice, and McEwen. American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History. New York: Harper, 2012.

MLA (8th ed.) Citation

Kyle, et al. American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History. Harper, 2012.