Close, J. and Hahn, Ulrike and Hodgetts, C. and Pothos, E.M. (2010) Rules versus similarity in concept learning. In: Mareschal, Denis and Quinn, P.C. and Lea, S. (eds.) The making of human concepts. Developmental Cognitive Neuroscience. Oxford, UK: Oxford University Press, pp. 29-52. ISBN 9780199549221.