000profdoc.um.ac.ir/articles/a/1021316.pdfBiber. D. (1988). Variation across speech and writing....
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000profdoc.um.ac.ir/articles/a/1021316.pdfBiber. D. (1988). Variation across speech and writing. Cambridge: Cambridge University Press. Downes, W. (1994). Register in literature. ELL,