Benjamin Franklin (1840). “The Works of Benjamin Franklin; Containing Several Political and Historical Tracts Not Included in Any Former Edition, and Many Letters, Official and Private, Not Hitherto Published; with Notes and a Life of the Author”, p.131
Benjamin Franklin's letter to David Hartley (December 4, 1789) as quoted in "The Writings of Benjamin Franklin," Volume 10 (p. 72) edited by Albert H. Smyth, 1907.
Nancy Spannaus, Christopher White, Alexander Hamilton, Thomas More, Henry VIII (2015). “The Political Economy of the American Revolution”, p.255, Executive Intelligence Review
Benjamin Franklin (1815). “The works of the late Dr. Benjamin Franklin: consisting of his Life, written by himself. Together with humorous, moral and literary essays, chiefly in the manner of the Spectator. Among which are several not in any American edition”, p.199