Adam Smith (2007). “The Wealth of Nations: An Inquiry Into the Nature and Causes of the Wealth of Nations: With an introduction by Jonathan B. Wight, University of Richmond”, p.311, Harriman House Limited
"Wesley Morris, boston globe film critic: 'they hate people who have opinions that run contrary to their fanaticism'". Interview with Naoki O'Bryan, jameson-zimmer.squarespace.com. April 15, 2013.
United States. President (1861-1865 : Lincoln), Abraham Lincoln (1861). “Message of the President of the United States to the Two Houses of Congress, at the Commencement of the First Session of the Thirty-seventh Congress”, p.16