1. Baum, W. M. (2002). From molecular to molar: A paradigm shift in behavior analysis. Journal of the Experimental Analysis of Behavior, 78, 95–116.
2. Bickel, W. K., & Etzel, B. C. (1985). The quantal nature of controlling stimulus-response relations as measured in tests of stimulus generalization. Journal of the Experimental Analysis of Behavior, 44, 245–270.
3. Bray, N. W., Fletcher, K. L., & Turner, L. A. (1997). Cognitive competencies and strategy use in individuals with mental retardation. In W. E. MacLean, Jr. (Ed.), Ellis’ handbook of mental deficiency, psychological theory and research (3rd ed., pp. 197–217). Hillsdale, NJ: Erlbaum.
4. Carter, D. E., & Werner, T. J. (1978). Complex learning and information processing by pigeons: A critical analysis. Journal of the Experimental Analysis of Behavior, 29, 565–601.
5. Cohen, L. R., Brady, J., & Lowry, M. (1981). The role of differential responding in matching-to-sample and delayed matching performance. In M. L. Commons & J. A. Nevin (Eds.), Quantitative analysis of behavior: Vol. 1. Discriminative properties of reinforcement schedules (pp. 345–364). Cambridge, MA: Ballinger.