1. Talks to Teachers on Psychology – and to Students on Some of Life’s Ideals;James,1899
2. Conditioned Reflexes: an Investigation of the Physiological Activity of the Cerebral Cortex;Pavlov,2015
3. A quantitative demonstration of animal drive;Dashiell;J. Comp. Psychol.,1925
4. A theory of human curiosity;Berlyne;Br. J. Psychol. Gen. Sect.,1954
5. The Evolution of Cognition;Heyes,2000