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Dyfyniad APA
Gelman, R., & Gallistel, C. R. (1978). The child's understanding of number. Harvard University Press.
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Dyfyniad Arddull Chicago
Gelman, Rochel, and C. R. Gallistel. The Child's Understanding of Number. Cambridge, MA: Harvard University Press, 1978.
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Dyfyniad MLA
Gelman, Rochel, and C. R. Gallistel. The Child's Understanding of Number. Harvard University Press, 1978.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.