1. Barnes, D., & Keenan, M. (1989). Positive and negative transer of stimulus functions, and generalization in the control of human schedule performance. Paper presented at the Annual Conference of the Experimental Analysis of Behaviour Group, Cambridge, England.
2. Devany, J.M., Hayes, S.C., & Nelson, R.O. (1986). Equivalence class formation in language-able and language-disabled children. Journal of the Experimental Analysis of Behavior, 46, 243–257.
3. Dixon, M. (1976). Teaching conceptual classes with receptive label training. Acta Symbolica, 9, 17–35.
4. Dugdale, N., & Lowe, C.F. (1990). Naming and stimulus equivalence. In D.E. Blackman and H. Lejeune (Eds.), Behaviour analysis in theory and practice: Contributions and controversies (pp. 115–138). Brighton, U.K.: Lawrence Erlbaum Associates.
5. Fields, L. (1990). The effects of testing protocols on the formation and expansion of equivalence classes. Paper presented at the Annual Conference of the Experimental Analysis of Behaviour Group, York, England.