4Macnamara, J. 1967. The Bilingual's Languistic Performance. Journal of Social Issues 23,58-770
5Cummins,J. 1997 Introduction. In J. Cummins and D. Corson (eds) Encyclupedia of Language and Education Volunie 5 Dordrecht,the Netherland :Kluwer Academic Publisher.
6Siguan,M and Mackey,W F. 1987 Education and bilinguilism. Paris, in association with UNESCO.
7Baker ,C. 1988 . Key issues in bilingualism and bilingual education. Clevendon, Avon: Multilingual Matters 35.
8Lambert, W.E. 1974. Culture and Language as Factors in learning and Education. in F . E . Aboud & R.D.Meade(eds). Cultureal Faction in Learning and Education. Bellingham , Washington.
