Variation across speech and writing. Biber, D. Cambridge University Press, Cambridge and New York, 1. edition, 1991.
bibtex   
@book{biber_variation_1991,
	address = {Cambridge and New York},
	edition = {1.},
	title = {Variation across speech and writing},
	isbn = {978-0-521-32071-9},
	publisher = {Cambridge University Press},
	author = {Biber, D.},
	year = {1991},
	keywords = {Comunicacao verbal, Englisch, Gesprochene Sprache, Language and languages, Oral communication, Schriftsprache, Written communication},
}

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