Thomas Jefferson, J. Jefferson Looney (2014). “The Papers of Thomas Jefferson: Retirement Series, Volume 10: 1 May 1816 to 18 January 1817”, p.285, Princeton University Press
Edward Gibbon (2016). “THE HISTORY OF THE DECLINE AND FALL OF THE ROMAN EMPIRE (All 6 Volumes): From the Height of the Roman Empire, the Age of Trajan and the Antonines - to the Fall of Byzantium; Including a Review of the Crusades, and the State of Rome during the Middle Ages”, p.2070, e-artnow
Jean de La Bruyère, Luc de Clapiers marquis de Vauvenargues (1903). “La Bruyère and Vauvenargues: Selections from the Characters, Reflexions and Maxims”
Bertrand Russell, Ray Perkins (Jr.) (2002). “Yours Faithfully, Bertrand Russell: A Lifelong Fight for Peace, Justice, and Truth in Letters to the Editor”, p.33, Open Court Publishing