4Gumperz, J. J.. Language in Social Groups [ M ]. Stanford : Stanford University Press, 1971.
5Cook, V. Second Language Learning and Language Teaching [ M ]. Edward Amold/Hodder Headline Group, 2001. ".
6Verschueren, Je. f Understanding Pragmatics [ M ]. Beijing: Foreign Language Teaching and Research Press, 1999.
7Appeal, R. and Muysken, P. 1987. Language contact and bilingualism. London: Edward Arnold.
8Auer, P. 1990. A discussion paper on codeswitching. In Papersfor the workshop on concepts, methndology and data. (Held in Basel,12-13, January 1990). Strasbourg: European Science Foundation.,69-88.
9Auer, P. ed. 1998. Code-switching in conversation: Language, interaction and identity. London and New York: Routledge.
10Azuma, S. 1998. Meaning and form in codeswitching. In Codeswitching Worldwide, ed. Rodolfo Jacobson. Berlin, New York:Mouton de Gruyter.
