David Hume (1854). “The Philosophical Works of David Hume: Including All the Essays, and Exhibiting the More Important Alterations and Corrections in the Successive Editions Pub. by the Author”, p.9
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.1209, e-artnow