Cohen, M. R. (1961). The meaning of human history (2nd.ed.). Open Court.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCohen, Morris R. The Meaning of Human History. 2nd.ed. Illinois: Open Court, 1961.
एमएलए (9वां संस्करण) प्रशस्ति पत्रCohen, Morris R. The Meaning of Human History. 2nd.ed. Open Court, 1961.
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