For a bibliographic essay on the Sources for the Fourth Crusade, see, Alfred Andrea, in Queller, Donald E., and Thomas F. Madden. The Fourth Crusade: The Conquest of Constantinople. Philadelphia: University of Pennsylvania Press, 1997, pp. 299-318.
Robert of Clari

Old French Edition: Robert of Clari. La conquête de Constantinople: édition bilingue. Champion classiques. Série “Moyen âge” 14, edited by Jean Dufournet Paris: 2004.

English Translation: Robert of Clari. The Conquest of Constantinople: Translated from the old French of Robert of Clari by Edgar Holmes McNeal. New York: 1936.

Villehardouin

Old French: La conquete de Constantinople. ed. Edmond Faral, 2 vols. Paris: 1938-1939.

Earlier editions of the old French were done by: Natalis de Wailly (1870) and Emile Bouchet (1891).

English Translation: Joinville and Villehardouin. Chronicles of the Crusades. Translated by Caroline Smith. London: 2008.

Older Penguin translation by Margaret R.B. Shaw (1967).

Henri de Valenciennes

Histoire de l’Empereur Henri de Constantinople, ed. Jean Longnon , Paris, 1948.

Gunther of Pairis

Gunther of Pairis Hystoria Constantinopolitana, ed. Peter Orth, Spolia Berolinensia 5 (Hildesheim: Weidmann, 1994).

English translation: The capture of Constantinople : the Hystoria Constantinopolitana of Gunther of Pairis, edited and translated by Alfred J. Andrea (Philadelphia: University of Pennsylvania, 1997).

Nicetas Choniates

Historia

Historia, ed. Jan-Louis van Dieten. 2 volumes. (Corpus Fontium Historiae Byzantinae, XI/1). Berline, De Gruyter, 1975.

Immanuel Bekker, CSHB, vol. 33. Bonn: Weber, 1835.

English Translation: Harry Magoulias, O City of Byzantium, Annales of Niketas Choniates. Detroit, Wayne State University Press, 1985.

Narratives of Relics Thefts/acquisitions following 1204.

These were all collected and edited by Riant. See: Riant, Paul Edouard Didier. Exuviae sacrae constantinopolitanae fasciculus documentorum minorum, ad exuvias sacras constantinopolitanas in occidentem saeculo XIII translatas, spectantium, & historiam quarti belli sacri imperijo: gallo-graeci illustrantium. Geneva: s.n., 1876. Reprint, Paris, 2004.

See also: Miller, E. “Review of Exuviae Sacrae Constantinopolitanae.” Journal des Savants  (1878): 292-309, 389-403; which add another text to the mix.

The principle sources were translated by A. Andrea (see below)

Source collection relating to the Fourth Crusade

Andrea, Alfred J. Contemporary sources for the Fourth Crusade. The medieval Mediterranean v. 29.  Leiden ; Boston: Brill, 2000.

Includes:

Items for them Registers of Innocent III

Count Hugh of Saint Pol’s Report to the West

Three accounts of Relic Theft (Devastatio Constantinopolitana; the Anonymous of Soissons; and the Deeds of the Bishop of Halberstadt)

Excerpts from the Chronicle of Ralph of Coggeshall

Excerpts from the Chronicle of Alberic of Trois Fontaines