1[1]Bex, Tony. Variety in Written English [M]. London and New York, Routledge,1996.
2[2]Freeborn, Dennis. Varieties of English[M]. Macmillan,1986.
3[3]Halliday, M. A. K. Language as Social Semiotic [M ].London :Edward Arnold, 1978.
4[4]Martin,J. English Tert[M]. Philadephia,John Benjamins Publishing Company, 1992.
5[5]Toolan,Michael. The Lahguage of Press Advertising[A]. In Ghadessy, Mohsen (ed). Registers of Written English [M ]. London and New York, Pinter Publishers, 1988.
