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.106, e-artnow
Edward Gibbon, J. B. Bury (2012). “The History of the Decline and Fall of the Roman Empire: Edited in Seven Volumes with Introduction, Notes, Appendices, and Index”, p.298, Cambridge University Press