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
Alexander Hamilton, James Madison, John Jay (1852). “The Federalist, on the new constitution, written in 1788, with an appendix, containing the letters of Pacificus and Helvidius on the proclamation of neutrality of 1793, also the original articles of confederation and the constitution of the United States”, p.50