1Belis R. E-mail activities in the ESL writing class [J]. The Internet TESL Journal,1996 (11/12) : 15--18.
2Gonzaley-Bueno M. The Effects of electronic mail on Spanish L2 discourse [J ]. Language Learning and Technology, 1998 (1/2): 55--70.
3Halliday MAK, R Hasan. Language, Context, and Text: Aspects of Languagdna Social-semiotic Perspective [ M ]. Oxford: Oxford University Press, 1989 : 65.
4DHymes. Oncommunicative Competence [M]. England Pennsylvania, penguinBook. 1972: 269--293.
5Torri-William Eiko. Incorporating the use of E-mail into a language program [J]. Computer Assisted LanguageLearning, 2004 (17/1): 109--122.