1. Bates, E., Dale, P. S., & Thal, D. (1995). Individual differences and their implications for theories of language development. In P. Fletcher & B. MacWhinney (Eds.), The handbook of child language (pp. 96–151). Cambridge, MA: Blackwell.
2. Bates, E., & Goodman, J. C. (2001). On the inseparability of grammar and the lexicon: Evidence from acquisition. In M. Tomasello & E. Bates (Eds.), Language development. The essential readings (pp. 134–162). Oxford, UK: Blackwell.
3. Bayley, N. (1993). The Bayley scales of infant development (2nd ed.). San Antonio, TX: The Psychological Corporation.
4. Choudhury, N., & Benasich, A. (2003). A family aggregation study: The influence of family history and other risk factors on language development. Journal of Speech, Language, and Hearing Research, 46, 261–272.
5. Cohen, J. (1988). Statistical power analysis for the behavioral sciences (2nd ed.). New York: Academic Press.