1. Etiological factors of endemic goiter in north-eastern Sicily
2. Demus O. The Mosaics of Norman Sicily. London: Routledge and Kegan Paul, 1949; 91–177.
3. Borsook E. Messages in Mosaic: The Royal Programmes of Norman Sicily (1130–1187). Woodbridge, UK: Boydell Press, 1998; 61.
4. Kitzinger E. The Mosaics of Monreale. Palermo, Italy: SF Flaccovio, 1960; 70–92.
5. Krén E Marx D. Mosaics in the Cathedral of Monreale (1180s). Web Gallery of Art. http://www.wga.hu/html_m/zgothic/mosaics/5monreal/ (3 June 2016, date last accessed).