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.3284, e-artnow
C. S. Lewis, Michael Ward (2017). “The Abolition of Man: C.S. Lewis’s Classic Essay on Objective Morality: A Critical Edition by Michael Ward”, p.63, TellerBooks