1910. Maternal instinct in a monkey. Journal of Animal Behavior,
vol. 5, 403-405.
1916. Provision for the study of the monkeys and apes. Science,
vol. 43, 231-234.
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.