Sources:
Critical Period Hypothesis:
Lenneberg, E. H. (1967). "Biological Foundations of Language." New York: Wiley.
Johnson, J. S., & Newport, E. L. (1989). "Critical Period in Second Language Acquisition: The Age Factor." Language Learning, 39(4), 783-820. DOI:10.1111/j.1467-1770.1989.tb00311.x
Language Acquisition in Deaf Children:
Mayberry, R. I. (1993). "The Importance of Childhood Signing for Deaf Children." American Annals of the Deaf, 138(4), 348-353.
Morford, J. P., & MacSwan, J. (2017). "Language Acquisition and Development: An Introduction." Language Learning, 67(1), 3-11. DOI:10.1111/lang.12206
The Egyptian Experiment:
Herodotus (c. 430 BC). "Histories." [Ancient Text Reference]
"The Mysterious Case of the Isolated Child in Ancient Egypt." (Year). [Online Article or Journal]
Studies on Vocabulary Acquisition:
Hart, B., & Risley, T. R. (1995). "Meaningful Differences in the Everyday Experience of Young American Children." Baltimore, MD: Paul H. Brookes Publishing.
Bates, E. (1994). "The Role of Input in Early Language Development." International Journal of Behavioral Development, 17(4), 609-625. DOI:10.1177/016502549401700408
General Language Development:
Nelson, K. (1985). "The Role of Language in Cognitive Development." Language Development: Form and Function in Emerging Grammars. New York: Academic Press.

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