John Flavel (1698). “Pneumatologia: A Treatise of the Soul of Man: Wherein the Divine Original, Excellent and Immortal Nature of the Soul are Opened ...”, p.42
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.1758, e-artnow