Keith, A. (1947). Evolution and ethics. New York: G.P. Putnam's Sons.
Lua i Stíl Chicago (17ú heag.)Keith, Arhur. Evolution and Ethics. New York: G.P. Putnam's Sons, 1947.
Lua MLA (8ú heag.)Keith, Arhur. Evolution and Ethics. New York: G.P. Putnam's Sons, 1947.
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