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Jules Michelet: Les croisades, 1095-1270; Paris, Hetzel et Cie., 1880.
Charles Mills: The History of the Crusades; London, Longmans, 1828, 2 vols.
Edwin Pears: The Fall of Constantinople; being the Story of the Fourth Crusade; London, Longmans & Co.; New York, Harpers, 1886.
Reinhold Röhricht: Beiträge zur Geschichte der Kreuzzüge; Berlin, Weidmann, 1874-78, 2 vols.
Reinhold Röhricht: Quellenbeiträge zur Geschichte der Kreuzzüge. Bd. i., Zur Geschichte Salâh-ad-dîns; Berlin, Weidmann, 1879.
Reinhold Röhricht: Studien zur Geschichte des fünften Kreuzzuges; Innsbruck, Wagner, 1891.
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Heinrich Carl Ludolf von Sybel: Geschichte des ersten Kreuzzuges; Leipzig, Fleischer, 1841; 2. Aufl., 1881.