Ducado da Pentápole (Portuguese Wikipedia)

Analysis of information sources in references of the Wikipedia article "Ducado da Pentápole" in Portuguese language version.

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4^th place

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Hallenbeck 1982, p. 7. Hallenbeck, Jan T. (1982). «Pavia and Rome: The Lombard Monarchy and the Papacy in the Eighth Century"». Filadélfia, Pensilvânia. Transactions of the American Philosophical Society. 72 (4). doi:10.2307/1006429