Perrin, Porter G.
Handbook of current English
Glenview, 1968
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The oxford dictionary of current english
Oxford university press , 1992
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The oxford dictionary of current english
edited by Della Thompson
Oxford University Press, 1996
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Newby, Michael
The structure of English : a handbook of English grammar
Cambridge University Press, 1988
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Hornby, Albert Sydney
Oxford student's dictionary of current English
Oxford University Press, 1984
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