Duby, G. (1982). Three orders: Feudal society imagined. University of Chicago Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDuby, Georges. Three Orders: Feudal Society Imagined. University of Chicago Press, 1982.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDuby, Georges. Three Orders: Feudal Society Imagined. University of Chicago Press, 1982.
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