2Barton, E. Evidentials, argumentation, and epistemological stance [J].College English,1993(55):745-69.
3Besnier, N. Reported speech and affect on Nukulaelae Atoll [ A ]. in J.H. Hill and J. T. Irvine ( eds. ) Repsonsibility and Evidence in Oral Discourse [C]. Cambridge: Cambridge University Press,1993.
4Biber, D. and E. Finegan. Style of stance in English: lexical and grammatical marking of evidentiality and affect [J]. Text, 1989(11) :93-124.
5Chafe, W. L. Evidentiality in English conversation and academic writing [A]. In W. L. Chafe, and J. Nichols (eds.) Evidentiality: The Linguistic Coding of Epistemology [C]. Norwool, NJ: Ablex, 1986.
6Conrad, Susan and Douglas Biber. Adverbial marking stance in speech and writing [A]. In Susan Huston and Geoff Thompson (eds.) Evaluation in Text : Authorial Stance and the Construction of Discourse [C]. Oxford: Oxford University Press,2000:.56- 73.
7Fairclough, Norman. Critical Discourse Analysis: The Critical Study of Language [M]. London: Longman. 1995.
8Halliday, M. A. K. Language as social semiotic : The social interpretation of language and meaning [M]. London: Edward Amnold, 1978.
9Halliday, M. A. K. Introduction to Functional Grammar [M]. London: EdwarD Arnold, 1985.
10Halliday, M. A. K. Introduction to Functional Grammar. 2nd edition[M]. London: Edward Arnold,1994.
