"About The Book". American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History. HarperCollins. Archived from the original on January 11, 2012. Retrieved June 22, 2012.
Kyle, Chris; McEwen, Scott; DeFelice, Chris (January 2, 2012). "American Sniper". Harper Collins. Archived from the original on January 11, 2012. Retrieved January 2, 2012.
m.harpercollins.com
Kyle, Chris; Doyle, William (June 2013). American Gun. HarperCollins. Archived from the original on April 19, 2016. Retrieved April 10, 2016.
"About The Book". American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History. HarperCollins. Archived from the original on January 11, 2012. Retrieved June 22, 2012.
Kyle, Chris; McEwen, Scott; DeFelice, Chris (January 2, 2012). "American Sniper". Harper Collins. Archived from the original on January 11, 2012. Retrieved January 2, 2012.