Chris Kyle, Scott McEwen, Jim DeFelice (2012). “American Sniper: The Autobiography of the Most Lethal Sniper in U.S. Military History”, p.8, Harper Collins
Paul Newman, A.E. Hotchner (2003). “Shameless Exploitation in Pursuit of the Common Good: The Madcap Business Adventure by the Truly Oddest Couple”, p.102, Nan A. Talese
"Elizabeth Gilbert, ‘Eat, Pray, Love’ Author, On What It Takes To Get Inspired". Interview with Chantal Pierrat, www.huffingtonpost.com. August 11, 2013.