O'Callaghan. The Last Crusade in the West. University of Pennsylvania Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रO'Callaghan. The Last Crusade in the West. University of Pennsylvania Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रO'Callaghan. The Last Crusade in the West. University of Pennsylvania Press.
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