BC Redman, Stuart et al.. A Way with Words Resource Pack Cambridge : CUP,
BC Swan, Michael. Practical English usage / Michael Swan . - 2nd ed. Oxford : Oxford University Press, 1995
BC Thomson, A.J.. A practical English grammar : Structure Drills 2 / A.J. Thomson, A.V. Martinet . 1st ed. Oxford : Oxford University Press, 1979
BC Thomson, A.J.. A practical English grammar. Structure Drills. 1 / A.J. Thomson, A.V. Martinet. 1st ed.,13th reimp. Oxford : Oxford University Press, 1994