Clark, W. R. (1999). A means to an end: The biological basis of aging and death. Oxford University Press.
Lua i Stíl Chicago (17ú heag.)Clark, William R. A Means to an End: The Biological Basis of Aging and Death. New York: Oxford University Press, 1999.
Lua MLA (9ú heag.)Clark, William R. A Means to an End: The Biological Basis of Aging and Death. Oxford University Press, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.