Cohen, J. E. (1995). How many people can the earth support? Norton.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रCohen, Joel E. How Many People Can the Earth Support? New York: Norton, 1995.
एमएलए (8वां संस्करण) प्रशस्ति पत्रCohen, Joel E. How Many People Can the Earth Support? Norton, 1995.
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