Clark, W. R. (1999). A means to an end: The biological basis of aging and death. Oxford University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रClark, William R. A Means to an End: The Biological Basis of Aging and Death. New York: Oxford University Press, 1999.
एमएलए (9वां संस्करण) प्रशस्ति पत्रClark, William R. A Means to an End: The Biological Basis of Aging and Death. Oxford University Press, 1999.
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