Ferrero, G., The Greatness and Decline of Rome. 5 vols. New York, 1909.

Fowler, W. Warde, Rome (Home University Library). London, 1912.

Frank, T., Roman Imperialism. New York, 1914.

Frank, T., A History of Rome. New York, 1923.

Gibbon, Edward, The Decline and Fall of the Roman Empire (Edition of J. B. Bury). 7 vols. London, 1896-1900.

Heitland, W. E., The Roman Republic. 3 vols. Cambridge, England, 1909.

Mommsen, Th., The History of Rome (Translated by W. P. Dickson), 5 vols. New York, 1895.

Pelham, H. F., Outlines of Roman History. New York, 1905.4

Jones, H. Stuart, The Roman Empire, B.C. 29-A.D. 476 (The Story of the Nations). New York, 1908.

Schiller, H., Geschichte der römischen Kaiserzeit. 2 vols. Gotha, 1883.