1. Curiosity and Exploration
2. Berlyne, D. E. (1967). Arousal and reinforcement. In D. Levine (Ed.), Nebraska symposium on motivation (pp. 1-110). Lincoln: University of Nebraska Press.
3. Berlyne, D. E. (1971). What next? Concluding summary. In H. I. Day, D. E. Berlyne, & D. E. Hunt (Eds.), Intrinsic motivation: A new direction in education (pp. 186-196). Toronto, Ontario, Canada: Holt, Rinehart & Winston of Canada.