1. Dickerson, D. J. Irrelevant stimulus dimensions and dimensional transfer in the discrimination learning of Experimental Child Psychology, 1967, 5, 228–236.
2. Harlow, H. F. Learning set and error factor theory. In S. Koch (Ed.), Psychology: A Study of a Science. Vol. 2. New York: McGraw-Hill, 1959.
3. Hilgard, E. R. Methods and procedures in the study of learning. In S. S. Stevens (Ed.), Handbook of Experimental Psychology. New York: Wiley, 1951.
4. Shepp, B. E., & Gray, V. A. Some effects of variable-withing and variable-between irrelevant stimuli on dimensional learning and transfer. Journal of Experimental Psychology, 1971, 89, 32–39.
5. Shepp, B. E. & Turrisi, F. D. Learning and transfer of mediating responses in discriminative learning. In N. R. Ellis (Ed.), International review of research in mental retardation. Vol. 2. New York: Academic Press, 1966.