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* Joseph Gill, "Innocent III and the Greeks: aggressor or apostle?" in Derek Baker, ed., ''Relations between East and West in the Middle Ages'' (Edimburgi, 1971) pp. 95-108
* Harris, Jonathan ''Byzantium and the Crusades''. London: Hambledon, 2003.
* Gherardo Ortalli, Giorgio Ravegnani, Peter Schreiner, edd., ''Quarta Crociata: Venezia, Bisanzio, Impero Latino''. Venetiis: Istituto Veneto di Scienze, Lettere ed Arte, 2006. 2 voll.
* Phillips, Jonathan ''The Fourth Crusade and the Sack of Constantinople'' London: Pimlico, 2005
* Queller, Donald E. ''The Latin Conquest of Constantinople''. New York: Wiley, 1971