Heinrich Carl Ludolf von Sybel: History and Literature of the Crusades; translated by Lady Duff-Gordon [not a translation of the preceding, but a compilation from his writings]; London, Chapman, 1861.
Friedrich Wilken: Geschichte der Kreuzzüge nach morgenländischen und abendländischen Berichten; Leipzig, Vogel, 1807-32, 7 parts.
IV. GENERAL HISTORIES IN WHICH THE PERIOD OF THE CRUSADES IS INCLUDED.
James Bryce: The Holy Roman Empire; London and New York, Macmillan, 1864; 8th ed., 1888.
George Finlay: A History of Greece from its Conquest by the Romans to the Present Time, B.C. 146 to A.D. 1864; Oxford, Clarendon Press, 1877, 7 vols.
Edward Gibbon: The History of the Decline and Fall of the Roman Empire; London, 1776-81, 6 vols. Best completed ed. by William Smith; London, Murray, 1854-55, 8 vols.; New York, Harpers. New ed., with additional notes by J. B. Bury; London and New York, Macmillan, 1896 sqq. (Chaps. lvii.-lxi., The Crusades, separately issued by A. Murray; London, 1869.)
François Pierre Guillaume Guizot: The History of Civilization from the Fall of the Roman Empire to the French Revolution; translation (in Bohn’s Standard Library; London, Bell; New York, Macmillan; 3 vols.).
François Pierre Guillaume Guizot: The History of France from the Earliest Times to the Year 1789; translation, London, Low, 1870-81, 6 vols.
Henry Hallam: View of the State of Europe during the Middle Ages; London, Murray, 1818, 2 vols.; 11th ed., 1855, 3 vols.; later eds.; reprinted, New York, Armstrong, 2 vols.
David Hume: The History of England; modern ed., London, Ward, Lock & Co., 1880, 3 vols.; Amer. ed., Harpers, 6 vols.