Clark, W. R. (1999). A means to an end: The biological basis of aging and death. Oxford University Press.
芝加哥风格引文Clark, William R. A Means to an End: The Biological Basis of Aging and Death. New York: Oxford University Press, 1999.
MLA引文Clark, William R. A Means to an End: The Biological Basis of Aging and Death. Oxford University Press, 1999.
警告：这些引文格式不一定是100％准确.