Newby, Michael
The structure of English : a handbook of English grammar
Cambridge University Press, 1988
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Wolfram, Walt, 1941-
American English: dialects and variation
Wiley Balckwell, 2016
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Pike, Kenneth L. (Kenneth Lee), 1912-2000
The Intonation of American English
University of Michigan Press, 1945
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Walters, Morgan L
Basic dictionary of American English
N.Y.Holt Rinehart and Winston,inc, 1966
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Walters, Margan L
Intermediate dictionary of American english
N.Y.Holt,Rinehart and winston,ic, 1966
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