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«Encyclopaedia Britannica». ص. The weakened Byzantine Empire called on fellow Christians in Western Europe to come to their aid, an appeal that led eventually to the mounting of the First Crusade.
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Dana C. Munro, "The Children's Crusade," The American Historical Review, Vol. 19, No. 3 (Apr. , 1914), pp. 516-524 in JSTOR; and Norman P. Zacour, "The Children's Crusade," in R. L. Wolff, and H. W. Hazard, eds. , The later Crusades, ۱۱۸۹–۱۳۱۱ (۱۹۶۹) pp. 325-342, esp. 330-37 online edition
Joseph R. Strayer, "The Crusades of Louis IX," in R. L. Wolff and H. W. Hazard, eds. , The later Crusades, ۱۱۸۹–۱۳۱۱ (۱۹۶۹) pp. 487-521 online edition; Peter Jackson, The Seventh Crusade, ۱۲۴۴–۱۲۵۴ (۲۰۰۷)excerpt and text search
Joseph R. Strayer, "The Crusades of Louis IX," in R. L. Wolff and H. W. Hazard, eds. , The later Crusades, ۱۱۸۹–۱۳۱۱ (۱۹۶۹) pp. 487-521 online edition