Johns, J. (2002). Arabic administration in Norman Sicily: The royal dīwān. Cambridge, U.K.,New York, NY, USA: Cambridge University Press.
Παραπομπή Chicago StyleJohns, Jeremy. Arabic Administration in Norman Sicily: The Royal Dīwān. Cambridge, U.K.,New York, NY, USA: Cambridge University Press, 2002.
Παραπομπή MLAJohns, Jeremy. Arabic Administration in Norman Sicily: The Royal Dīwān. Cambridge, U.K.,New York, NY, USA: Cambridge University Press, 2002.
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