4Baker, C. 1993. Foundations of Bilingual Education and Bilingualism [M]. Clevedon: Multilingual Matters Ltd.
5Cazden, C.B. & Snow, C.E. 1990. preface. In Cazden, C.B. & C.E.Snow (eds) English Plus: Issues in Bilingual Education[C]. London:Sage.
6Cummins, J. 1992. Heritage language teaching ia Canadian schools. Journal of Curriculum Studies. 24 (3) , 281-286.
7Fishman, J.A. 1976. Bilingual Education. An International Sociological Perspective[M].Rowley, MA: Newbury House.
8Fortier, d'Lberville. 1990. Commissioner of Official Languages Annual Reports 1989, 1990[C].
9Horaberger,N.H.1991.Extending enrichment bilingual education: revisiting typologies and redirecting Policy [A]. In O.Garcia (ed.) Bilingual Education: Focuss-chrift in Honour of Joshua A.Fishman, Volume I[C]. Amsterdam/Philadelphia: John Benjamins
10Lambert, W. E. 1980. The social psychology of language [A]. In H. Giles, W.P. Robinson and P. M. Smith (eds) Language: Social Psychological Perspectives[C]. Oxford: Pergamon.