Place, U. T. (1990-01-18). Symbolic processes and stimulus equivalence. Departmental Seminar, Department of Psychology, University College of North Wales, Bangor, 18 January 1990.
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Place, U. T. (1991-04-05). Symbolic processes and stimulus equivalence. Annual Conference of the Experimental Analysis of Behavior Group, Department of Psychology, University College, London, 5 April 1991.
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Place, U. T. (1991-05-26a). Symbolic processes and stimulus equivalence. Session on 'Current Issues in Stimulus Equivalence', 17th Annual Convention of the Association for Behavior Analysis, Atlanta, Georgia, 26 May 1991.
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Place, U. T. (1992-06-14). Symbolic processes and stimulus equivalence. The Fifteenth Symposium on Quantitative Analyses of Behavior on 'Stimulus Relations', Harvard University, Cambridge, MA, 14 June 1992.
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