Butterfield, H. (1981). The origins of history (First edition.). Basic Book Inc. Publisher.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रButterfield, Herbert. The Origins of History. First edition. New York: Basic Book Inc. Publisher, 1981.
एमएलए (8वां संस्करण) प्रशस्ति पत्रButterfield, Herbert. The Origins of History. First edition. Basic Book Inc. Publisher, 1981.
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