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.427, Cambridge University Press
George Whitefield (1812). “Seventy-five Sermons on Various Important Subjects: In this Complete Collection is Included the Eighteen Sermons Taken in Short Hand by Mr. Gurney. And to which is Now Added, a Sermon of the Character, Preaching, &c. of the Rev. Mr. Whitefield”, p.412