С. H. Waddington, The Strategy of the Genes: A Discussion of Aspects of Theoretical Biology (George Allen and Unwin, London, 1957).
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Paul Ekman and Wallace V. Friesen, Unmasking the Face (Prentice-Hall, Englewood Cliffs, N. J., 1975); Paul Ekman, Darwin and Cross-Cultural Studies of Facial Expression, in Paul Ekman, ed., Darwin and Facial Expression: A Century of Research in Review (Academic Press, New York, 1973).
