Jean Piaget Society. (1986). Cognitive development. Ablex Pub. Corp..
Chicago-čujuhus (17. p.)Jean Piaget Society. Cognitive Development. Norwood, N.J.: Ablex Pub. Corp., 1986.
MLA-čujuhus (9. p.)Jean Piaget Society. Cognitive Development. Ablex Pub. Corp., 1986.
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