Gelman, R., & Gallistel, C. R. (1978). The child's understanding of number. Harvard University Press.
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Chicago-čujuhus (17. p.)
Gelman, Rochel, juo C. R. Gallistel. The Child's Understanding of Number. Cambridge, MA: Harvard University Press, 1978.
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MLA-čujuhus (9. p.)
Gelman, Rochel, juo C. R. Gallistel. The Child's Understanding of Number. Harvard University Press, 1978.
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