6Bloomfield, L. 1933. Language. New York: Holt,Rinehart, and Winston
7Chomsky. N. 1980. Rules and Representations. New York; Columbia University Press Ellis, R. 1985. Understanding Second Language Acquisition. Oxford; Oxford University Press
8Krashen, S. 1982. Principles and Practice in Second Language Acquis;tion. Oxford: Pergamon
9Lenneberg, E. 1967. Biological Foundations of Language. New York: Wiley and Sons
10Patsy, M. LightbownandNinaSpada, 1993. How Language are Learned Oxford: Oxford University Press