APA (7th ed.) Zitazioa
Beard, R. M. (2006). An outline of piaget's developmental psychology. Routledge.
Chicago Style (17th ed.) Zitazioa
Beard, Ruth M. An Outline of Piaget's Developmental Psychology. Abingdon: Routledge, 2006.
MLA (9th ed.) Zitazioa
Beard, Ruth M. An Outline of Piaget's Developmental Psychology. Routledge, 2006.
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