1. Bindra, D. (1947). Water hoarding in rats. Journal of Comparative & Physiological Psychology, 40, 149–156.
2. Bindra, D. (1948). What makes rats hoard? Journal of Comparative & Physiological Psychology, 41, 379–402.
3. Covich, A. P. (1987). Optimal use of space by central place foragers: When and where to store surplus resources. In L. Green & H. Kagel (Eds.), Advances in behavioural economics (pp. 249–294). Norwood, NJ: Ablex.
4. Ewer, R. F. (1971). The biology and behavior of a free-living population of black rats (Rattus rattus). Animal Behaviour Monographs, 4, 126–174.
5. Helson, H. (1959). Adaptation level theory. In S. Koch (Ed.), Psychology: A study of science (Vol. 1, pp. 565–621). New York: McGraw-Hill.