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Notes

References

Sources

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Further reading

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* Borchert. Catherine M. and Zihlman, Adrienne L. (1990) The ontogeny and phylogeny of symbolizing, in Foster and Botscharow (eds)
* Bates, E., with L. Benigni, I. Bretherton, L. Camaioni, & V. Volterra. (1979). The emergence of symbols: Cognition and communication in infancy. New York: Academic Press
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External links

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