Voneche, J. J. (1977). The essential piaget. Basic books.
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Dyfyniad Arddull Chicago
Voneche, Jacques J. The Essential Piaget. New York: Basic books, 1977.
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Dyfyniad MLA
Voneche, Jacques J. The Essential Piaget. Basic books, 1977.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.