Todes, D. P. (1989). Darwin without Malthus: The struggle for existence in Russian evolutionary thought. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रTodes, Daniel Philip. Darwin Without Malthus: The Struggle for Existence in Russian Evolutionary Thought. New York: Oxford University Press, 1989.
एमएलए (9वां संस्करण) प्रशस्ति पत्रTodes, Daniel Philip. Darwin Without Malthus: The Struggle for Existence in Russian Evolutionary Thought. Oxford University Press, 1989.
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