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BB Dudley-Evans, Tony. . Engineering / Tony Dudley-Evans, Tim Smart, John Wall . [1st ed., 6th. imp.] Harlow, Essex : Harlow, Essex :Longman, 1987
BC ALEXANDER, L. G.: Longman English Grammar Practice. Longman. 1990
BC MURPHY, Raymond: English Grammar in Use. (Intermediate)Cambridge University Press. 1992