1. Bower, R. (1977).A primer on infant development. San Francisco: W. H. Freeman.
2. Bowerman, M. (1974). Learning the structure of causative verbs: A study in the relationship of cognitive, semantic, and syntactic development.Papers and Reports on Child Language Development, 8, 142?178.
3. Bowerman, M. (1982). Starting to talk worse: Clues to language acquisition from children's late speech errors. In S. Strauss (Ed.),U-shaped behavioral growth. New York: Academic Press.
4. Brown, R. (1973).A first language: The early stages. Cambridge, MA: Harvard University Press.
5. Chomsky, N., & Halle, M. (1968).Sound pattern of English. New York: Harper and Row.