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Ross, B.H., Taylor, E.G., Middleton, E.L., & Nokes, T.J. (2008).  Concept and category learning in humans.  In H.L. Roediger, III (Ed.), Cognitive Psychology of Memory. Vol. [2] of Learning and Memory: A Comprehensive Reference (pp. 535-557), 4 vols. (J.Byrne Editor). Oxford: Elsevier.