BB	Oxenden, Clive. New English File. Intermediate. Student's book / Clive Oxenden, Christina Latham-Koenig . - 1st published, repr. Oxford : Oxford University Press, 2012
BB	Oxenden, Clive. New English File. Intermediate. Woorkbook / Clive Oxenden, Christina Latham-Koenig ; with Tracy Byrne . - 1st published, repr. Oxford : Oxford University Press, 2012
BB	Vince, Michael. First certificate language practice : english grammar and vocabulary / Michael Vince . 1st ed., reimpr. Oxford : Macmillan, 2009
BC	Swan, Michael. Practical English usage / Michael Swan . 3rd. ed. Oxford : Oxford University Press, 2005