John Adams, Abigail Adams, Thomas Jefferson (1988). “The Adams-Jefferson Letters: The Complete Correspondence Between Thomas Jefferson and Abigail and John Adams”
George Washington, United States. President (1789-1797 : Washington) (1847). “Washington's Farewell Address to the People of the United States of America: Published in September, 1796”, p.9
Benjamin Franklin (1987). “Poor Richard's Almanack: Being the Choicest Morsels of Wisdom, Written During the Years of the Almanack's Publication”, p.16, Peter Pauper Press, Inc.
Thomas Paine (2016). “THE AGE OF REASON - Investigation of True and Fabulous Theology (Including “The Life of Thomas Paine”): Deistic Critique of Bible and Christian Church”, p.99, e-artnow