Siehe Amram Scheinfeld, Women and Men (New York, Harcourt, 1944); Theodosius Dobzhandsky, Heredity and the Nature of Man (New York, World, 1964); Remy de Goncourt, The Natural Philosophy of Love (New York, Boni and Liveright, 1922); Ashley Montagur, The Natural Superiority of Women (New York, Macmillan, 1952); Havelock Ellis, Man and Woman (London, Heinemann, 1934); Frank Leslie Ward, Pure Sociology (New York, Macmillan 1911); Louis Dublin, The Facts of Life from Birth to Death (New York, Macmillan, 1951); Susan Michelmore, Sexual Reproduction (New York, Natural History Press, 1964); Edward Ca