John Adams, Charles Francis Adams (1851). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.280
John Adams' letter to Benjamin Rush (December 21, 1809), as quoted in "No, Mr. Beck, John Adams Did Not Think Governments Must Be Administered by the Holy Ghost" by Chris Rodda, www.huffingtonpost.com. June 16, 2010.
John Adams, Charles Francis Adams (1854). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.126
John Adams, Charles Francis Adams (1850). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.131
John Adams, Thomas Jefferson, Abigail Adams, Lester Jesse Cappon, Institute of Early American History and Culture (Williamsburg, Va.) (1988). “The Adams-Jefferson letters: the complete correspondence between Thomas Jefferson and Abigail and John Adams”, The University of North Carolina Press
"A Defence of the Constitutions of Government". Book by John Adams. Chapter 3: "Marchamont Nedham: Errors of Government and Rules of Policy", Sixth Rule, 1787.
John Adams, Charles Francis Adams (1851). “The Works of John Adams, Second President of the United States: With a Life of the Author, Notes and Illustrations”, p.422