Alberzoni 2004, p. 42. For the alternative spelling "Henry of Septala", see Wolff and Hazard 1969, p. 821. For the Latin spelling Henricus in contemporary documents, see Powell 2010, p. 228. Alberzoni, Maria Pia (2004). Clare of Assisi and the Poor Sisters in the Thirteenth Century. Franciscan Institute Publications. Van Cleve, Thomas C. (1969). "The Fifth Crusade"(PDF). In R. L. Wolff; H. W. Hazard (eds.). A History of the Crusades, Vol. 2: The Later Crusades, 1189–1311. University of Wisconsin Press. pp. 376–428. Powell, James M. (2010). Anatomy of a Crusade, 1213–1221. University of Pennsylvania Press.
Van Cleve 1969, p. 421. Van Cleve, Thomas C. (1969). "The Fifth Crusade"(PDF). In R. L. Wolff; H. W. Hazard (eds.). A History of the Crusades, Vol. 2: The Later Crusades, 1189–1311. University of Wisconsin Press. pp. 376–428.
