References
- Fjeld , H. A. 1934 . The limits of learning ability in rhesus monkeys . Genet. Psychol. Monog. , 15 : 369 – 537 .
- Warden , C. J. 1931 . Animal motivation: experimental studies on the albino rat , 502 New York : Columbia Univ. Press .
- Warden , C. J. , Jenkins , T. N. and Warner , L. H. 1934 . Introduction to comparative psychology , 581 New York : Ronald . (See esp. Ch. 6.)
- Warden , C. J. and Jackson , T. A. 1935 . Imitative behavior in the rhesus monkey . J. Genet. Psychol. , 46 : 103 – 125 .