Internet History Sourcebooks Project
Fordham University: Medieval Sourcebook: Chronicle of the Fourth Crusade
Fordham University provides this site with information about Geoffrey de Villehardouin's chronicle of the Fourth Crusade, including the conquest of Constantinople.
Internet History Sourcebooks Project
Fordham University: Medieval Sourcebook: The Fourth Crusade 1204
Fordham University provides a collection of writings about the crusade, covering the Fourth Crusade from its initial events to its conclusion.
Boise State University
History of the Crusades
A class that is available online includes the following Study Units: The Creation of Outremer, Outremer through the Fall of Edessa, Jerusalem Lost, Crusading Fervor, The Last Years and After. Other helpful pages offer timelines, maps,...
Internet History Sourcebooks Project
Fordham University: Medieval Sourcebook: The Sack of Constantinople
This site from the Fordham University provides Niceta Choniate's first person account of the sacking of Constantinople by the crusaders of the fourth crusade.
Other
Italian Culture: Preparation for the Fourth Crusade
A discussion of the preparation by the Venetians for the Fourth Crusade, along with a discussion of their motives.