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? Riley-Smith (1979), "The Title of Godfrey of Bouillon", Bulletin of the Institute of Historical Research 52, pp. ? Murray, Alan V. (1990), "The Title of Godfrey of Bouillon as Ruler of Jerusalem", Collegium Medievale 3, pp. ? Riley-Smith? The Crusades: A History (2nd ed.)? ??. ? Riley-Smith? The First Crusade and the Idea of Crusading? ?. ? Runc

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