Abulafia, David. Frederick II: A Medieval Emperor (Pimlico, London, 1988)
Buy on Amazon, Search for Library with Worldcat
Van Cleve, Thomas. The Emperor Fredercick II of Hohenstaufen. (Clarendon, Oxford, 1972) Buy on Amazon, Search for Library with Worldcat
Kantorowicz, Ernest. Frederick the Second, 1194-1250. Frederick Ungsr, NY. 1957. Search for Library with Worldcat
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