Bárány,Attila(2010).“The English relations of Charles II of Sicily and Maria of Hungary”.InKordé, Zoltán;Petrovics, István.Diplomacy in the Countries of the Angevin Dynasty in the Thirteenth–Fourteenth Centuries.Accademia d'Ungheria in Roma.pp.57–77.ISBN978-963-315-046-7
Runciman,Steven(1958).The Sicilian Vespers: A History of the Mediterranean World in the Later Thirteenth Century.Cambridge University Press.ISBN978-1-107-60474-2