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* Riley-Smith, Jonathan. ''The Crusades: A Short History''. Great Britian, 1987.
* Vryonis, Speros. ''Byzantium and Europe''. Harcourt, Brace & World, New York, c1967.
* Runciman, Steven. '''Byzantine Civilization'''. Cleveland World Publ. Co. 1965.
* Treece, Henry. ''The Crusades''. London, 1962.
* Atiya, Aziz A. ''Crusade, Commerce and Culture''. Indiana University Press, 1962.
