, 1999, Reclaiming concepts, in R. Nunez & W. Freeman (eds.), Reclaiming cognition, Thorverton, Imprint Academic, pp. 61-78.
with Varela, F. , Thompson, E. , 1991, The embodied mind: Cognitive science and human experience, MIT Press, Cambridge, Mass.
, 1973a, 'Natural categories', Cognitive Psychology 8, 328-350.