Williams, R. J. (1946). The human frontier: A new pathway for science toward a better understanding of ourselves. Harcourt, Brace and company.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWilliams, Roger John. The Human Frontier: A New Pathway for Science Toward a Better Understanding of Ourselves. New York: Harcourt, Brace and company, 1946.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWilliams, Roger John. The Human Frontier: A New Pathway for Science Toward a Better Understanding of Ourselves. Harcourt, Brace and company, 1946.
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