(1991). Population, resources and the environment: The critical challenges. United Nations Population Fund.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रPopulation, Resources and the Environment: The Critical Challenges. New York: United Nations Population Fund, 1991.
एमएलए (9वां संस्करण) प्रशस्ति पत्रPopulation, Resources and the Environment: The Critical Challenges. United Nations Population Fund, 1991.
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