Guilland, Rodolphe (1967). "Le Drongaire de la flotte, le Grand drongaire de la flotte, le Duc de la flotte, le Mégaduc". Recherches sur les institutions byzantines [Studies on the Byzantine Institutions]. Berliner byzantinische Arbeiten 35 (in French). Vol. I. Berlin and Amsterdam: Akademie-Verlag & Adolf M. Hakkert. pp. 535–562. OCLC878894516.
Pope Innocent III, Letters, 126 (given July 12, 1205, and addressed to the papal legate, who had absolved the crusaders from their pilgrimage vows). Text is taken from the Internet Medieval Sourcebook by Paul Halsall. Modified. Original translation by J. Brundage.
Guilland, Rodolphe (1967). "Le Drongaire de la flotte, le Grand drongaire de la flotte, le Duc de la flotte, le Mégaduc". Recherches sur les institutions byzantines [Studies on the Byzantine Institutions]. Berliner byzantinische Arbeiten 35 (in French). Vol. I. Berlin and Amsterdam: Akademie-Verlag & Adolf M. Hakkert. pp. 535–562. OCLC878894516.