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.988, e-artnow
Edward Gibbon, Francis Parkman, William H. Prescott, Theodore Roosevelt (2012). “The Modern Library Essential World History 4-Book Bundle: The Decline and Fall of the Roman Empire (Abridged); Montcalm and Wolfe; History of the Conquest of Mexico; The Naval War of 1812”, p.648, Modern Library