1. Bailey, A. M., & Thomas, R. K. (1998). An investigation of oddity concept learning by rats. The Psychological Record, 48, 333–344.
2. Bernstein, I. S. (1961). The utilization of visual cues in dimension-abstracted oddity in primates. Journal of Comparative and Physiological Psychology, 54, 243–247.
3. Harlow, H. (1959). Learning set and error factor theory. In S. Koch (Ed.), Psychology a study of a science Vol. 2: General systematic formulations, learning and special processes (pp. 492–537). New York: McGraw-Hill.
4. Hodos, W. (1970). Evolutionary interpretation of neural and behavioral studies of living vertebrates. In F. O. Schmitt (Ed.), The neurosciences: Second study program (pp. 26–39). New York: Rockefeller University Press.
5. Langworthy, R. A., & Jennings, J. W. (1972). Odd ball, abstract, olfactory learning in laboratory rats. The Psychological Record, 22, 487–490.