Tohutoro APA (7th ed.)
Beard, R. M. (2006). An outline of Piaget's development psychology. Routledge.
Tohutoru Kātū Chicago (17th ed.)
Beard, Ruth M. An Outline of Piaget's Development Psychology. London: Routledge, 2006.
Tohutoro MLA (9th ed.)
Beard, Ruth M. An Outline of Piaget's Development Psychology. Routledge, 2006.
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