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Bibliography- Sixth Crusade
The Crusade of Frederick II: 1228-1229
Kantorowicz, Ernst. Frederick II, 1194-1250. Translated by E. O. Lorimer. New York: F. Ungar, 1957.
(Originally in German, 1931)
Powell, James M. "Patriarch Gerold and Frederick II: the Matthew Paris Letter." Journal of Medieval History
25:1 (1999): 16-26.
Van Cleve, Thomas C. "The Crusade of Frederick II." In A History of the Crusades (Editor in Chief, Kenneth
Meyer Setton) Vol. II The Later Crusades, 1189-1311. Edited by R. L. Wolff and Harry W. Hazard. 429-63.
Madison: University of Wisconsin Press, 1969-89.
Van Cleve, Thomas. The Emperor Frederick II of Hohenstaufen, immutator mundi. Oxford, Clarendon Press,
1972.