Variation across speech and writing. Biber, D. Cambridge University Press, Cambridge.
bibtex   
@book{biber_variation_1988,
	Address = {Cambridge},
	Author = {Biber, Douglas},
	Date = {1988},
	Date-Modified = {2016-09-22 20:24:10 +0000},
	Keywords = {phonetics, sociolinguistics, speaking styles},
	Publisher = {Cambridge University Press},
	Title = {Variation across speech and writing}}
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