John Van Antwerp. The Late Medieval Balkans: A Critical Survey from the Late Twelfth Century to the Ottoman Conquest. University of Michigan Press. Chicago, 1994 (http://books.google.com/?id=Hh0Bu8C66TsC)
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Lala, Eleva.Regnum Albaniae, the Papal Curia, and the Western Visions of a Borderline Nobility. Central European University, Department of Medieval Studies. Budapest,2008 (http://www.etd.ceu.hu/2009/mphlae01.pdf)