BC	A comprehensive grammar of the English language / Randolph Quirk ... [et al.] ; index by David Crystal . 1st. pub., 7th (corrected) impression London : Longman, cop. 1989
BC	Hewings, Martin. Advanced grammar in use : a self-study reference and practice book for advanced learners of English : with answers and cd-rom / Martin Hewings . 3rd. ed.. 3rd. printing Cambridge : Cambridge University Press, 2014
BC	Longman dictionary of contemporary English . - 3rd. ed. London : Longman, 1995
BC	Longman grammar of spoken and written English / Douglas Biber ... [et al.] ; Foreword by Randolph Quirk . - [1st ed., 4th imp.] Harlow : Longman, 2004
BC	McCarthy, Michael. English Vocabulary in Use : Advanced / Michael McCarthy, Felicity O'Dell . 1st. publ. , 10th print. Cambridge : Cambridge University Press, 2008
BC	Swan, Michael. Practical English usage / Michael Swan . - [1st ed.], 16th imp. Oxford : Oxford University Press, 1988