1. Bickerton, D. (1999). Creole languages, the language bioprogram hypothesis, and language acquisition. In W. C. Ritchie & T. K. Bhatia (eds.), Handbook of child language acquisition (pp. 195–220). San Diego, CA: Academic Press.
2. Bühler, K. (1990). The Theory of Language. Amsterdam: John Benjamin's Publishing Company..
3. Cavalli-Sforza, L. L. (2000). Genes, Peoples, and Languages. New York: North Point Press.
4. Chomsky, N. (1998). Aspects of the theory of syntax. Cambridge, MA: MIT Press.
5. Chomsky, N. (1999). On the nature, use, and acquisition of language. In W. C. Ritchie, & T. K. Bhatia (Eds.), Handbook of child language acquisition (pp. 33–54). San Diego, CA: Academic Press.