Abbas Daneshvari, Medieval tomb towers of Iran, Lexington 1986; James Dickie, "Allah and eternity: mosques, madrasas and tombs" in Architecture of the Islamic world, ed. George Michell, London 1984; Robert Hillenbrand, Islamic architecture: form, function and meaning, Edinburgh 1994; Viktoria Meineck-Berg, "Egypt", in Architecture of the Islamic world, ed. George Michell, London 1984; George Michell, "North Africa and Sicily", in Architecture of the Islamic world, ed. George Michell, London 1984.