Tignor, R. L. (2014). Worlds together, worlds apart, volume 1: Beginnings through the fifteenth century (Fourth edition.). W. W. Norton and Company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTignor, Robert L. Worlds Together, Worlds Apart, Volume 1: Beginnings Through the Fifteenth Century. Fourth edition. New York ; London: W. W. Norton and Company, 2014.
एमएलए (8वां संस्करण) प्रशस्ति पत्रTignor, Robert L. Worlds Together, Worlds Apart, Volume 1: Beginnings Through the Fifteenth Century. Fourth edition. W. W. Norton and Company, 2014.
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