Thomas Jefferson (1853). “The writings of Thomas Jefferson: being his autobiography, correspondence, reports, messages, addresses, and other writings, official and private”, p.389
Thomas Jefferson (2011). “Jefferson on Freedom: Wisdom, Advice, and Hints on Freedom, Democracy, and the American Way”, p.23, Skyhorse Publishing, Inc.
George Washington, Andrew Jackson (1862). “Washington's Farewell Address: The Proclamation of Jackson Against Nullification, and the Declaration of Independence”, p.8