Abulafia, David. Frederick II: A Medieval Emperor (Pimlico, London, 1988)

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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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