M. Harun, “Paul Moses, The Saint and the Sultan: The Crusades, Islam, and Francis of Assisi’s Mission of Peace, New York: Doubleday, 2009, 302 hlm. : John Tolan, Saint Francis and the Sultan: The Curious History of a Christian-Muslim Encounter, Oxford: Oxford University Press, 2009, xvi + 382 hlm. Frank M. Rega, St. Francis of Assisi and the Conversion of the Muslims, Rockford: Ill.: Tan Books, 2007, 125 hlm. ”, diskursus, vol. 9, no. 2, pp. 289-296, Oct. 2010.