Review from 'Scientific American', published in August 1953
New York, A. A. Knopf, 1923.
LondonChatto & Windus1923
New York, L. MacVeagh, The Dial Press, 1932.
article by Julian Sorell Huxley published in Creation by Evolution, 1928
libro de Herbert George Wells
book
cuento de Julian Huxley
1927 version
New York[Hafner Pub. Co.]1963.
Cambridge [Eng.]University press;1912.
1940 book by J.S. Huxley
written work by Thomas Henry Huxley
entry in the Dictionary of National Biography 1927 supplement
libro de Albert Einstein
cortometraje de 1934
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