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The Origins of Intelligence in Children. Norton, New York, (1952)The Psychology of the Child, and . Basic Books, New York, (1969)The Child's Conception of Number. Routledge, (1997)La formation du symbole chez lénfant. Delachaux et Niestle, (1994)Play, dreams and imitation in childhood. Routledge, London, (1999)Biologie et connaissance. Delachaux et Niestlé, (1992)Play, dreams and imitation in childhood. Norton Press, New York, (1962)Genetic epistemology. Columbia University Press New York, (1970)La psychologie de l/enfant, and . Puf, (2003)Morphismes et catégories. Delachaux et Niestlé, (1990)