Warner. The Lost History of "Piers Plowman". University of Pennsylvania Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWarner. The Lost History of "Piers Plowman". University of Pennsylvania Press.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWarner. The Lost History of "Piers Plowman". University of Pennsylvania Press.
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