Jean Piaget Society. (1986). Cognitive development. Ablex Pub. Corp..
Cita Chicago (17th ed.)Jean Piaget Society. Cognitive Development. Norwood, N.J.: Ablex Pub. Corp., 1986.
Cita MLA (9th ed.)Jean Piaget Society. Cognitive Development. Ablex Pub. Corp., 1986.
Atenció: Aquestes cites poden no estar 100% correctes.