Atkinson, M. (1992). Children's Syntax: An Introduction to Principles and Parameter Theory (Oxford: Blackwell).
2.
Hofstadter, D.R. (1980). Godel, Escher, Bach: An Eternal Golden Braid (New York: Vintage Books).
3.
Penner, Z. (1994). Possible domains for individual variation in early developmental stages In R. Tracy and E. Lattey (eds), How Tolerant is Universal Grammar? Essays on Language Learnability and Language Variation (Tübingen: Niemeyer), 35-58.
4.
Pinker, S. (1987). The bootstrapping problem in language acquisition . In Brian MacWhinney (ed.), Mechanisms of Language Acquisition (Hillsdale, NJ: Erlbaum), 399-441.