Britt 2007, p. 23. Britt, Karen C. (2007). "Roger II of Sicily: Rex, Basileus, and Khalif? Identity, Politics, and Propaganda in the Cappella Palatina". Mediterranean Studies. 16. Penn State University Press: 21–45. doi:10.2307/41167003. JSTOR41167003.
Britt 2007, p. 24. Britt, Karen C. (2007). "Roger II of Sicily: Rex, Basileus, and Khalif? Identity, Politics, and Propaganda in the Cappella Palatina". Mediterranean Studies. 16. Penn State University Press: 21–45. doi:10.2307/41167003. JSTOR41167003.
jstor.org
Britt 2007, p. 23. Britt, Karen C. (2007). "Roger II of Sicily: Rex, Basileus, and Khalif? Identity, Politics, and Propaganda in the Cappella Palatina". Mediterranean Studies. 16. Penn State University Press: 21–45. doi:10.2307/41167003. JSTOR41167003.
Britt 2007, p. 24. Britt, Karen C. (2007). "Roger II of Sicily: Rex, Basileus, and Khalif? Identity, Politics, and Propaganda in the Cappella Palatina". Mediterranean Studies. 16. Penn State University Press: 21–45. doi:10.2307/41167003. JSTOR41167003.