Johns, J. (2002). Arabic administration in Norman Sicily: The royal dīwān. Cambridge, U.K.,New York, NY, USA: Cambridge University Press.
Chicago Style aipamenaJohns, Jeremy. Arabic Administration in Norman Sicily: The Royal Dīwān. Cambridge, U.K.,New York, NY, USA: Cambridge University Press, 2002.
MLA aipamenaJohns, Jeremy. Arabic Administration in Norman Sicily: The Royal Dīwān. Cambridge, U.K.,New York, NY, USA: Cambridge University Press, 2002.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.