Part 23

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WITMER, L. A monkey with a mind. Psychological Clinic, vol. 3, 179-205. 1909.

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YERKES, R.M. The study of human behavior. Science, vol. 39, 625-633. 1914.

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YERKES, R.M. and COBURN, C.A. A study of the behavior of the pig 1915. Sus scrofa by the multiple-choice method. Journal of Animal Behavior, vol. 5, 185-225.