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Ferdinand Chalandon, Histoire de la domination normande en Italie et en Sicilie. París, 1907. En francés.
H.R. Ellis Davidson. The Viking Road to Byzantium. Londres: George Allen & Unwin Ltd., 1976. ISBN0-04-940049-5
Deno John Geanakopoulos. Emperor Michael Palaeologus and the West, 1258-1282: A Study in Byzantine-Latin Relations. Hamden, Connecticut: Archon Books, 1973. ISBN-13: 978-0208013101 .
John Haldon. Warfare, State and Society in the Byzantine World, 565–1204.Londres: UCL Press, 1999. ISBN1-85728-495-X
Patricia Skinner, Family Power in Southern Italy: The Duchy of Gaeta and its Neighbours, 850-1139. Cambridge University Press, 1995. En inglés.
Warren T. Treadgold. A History of the Byzantine State and Society. Stanford: Stanford University Press, 1997. ISBN0-8047-2630-2