1. Novelty and curiosity as determinants of exploratory behavior;Berlyne;Brit. J. Psychol.,1950
2. The relation of previous experience to insightful problem-solving;Birch;J. comp. Psychol.,1945
3. Comments on Professor Harlow's paper;Brown,1953
4. “The Motivation of Behavior.”;Brown,1961
5. Discrimination learning by rhesus monkeys to visual-exploration motivation;Butler;J. comp. physiol. Psychol.,1953