THOMSON, A., & MARTINET, A. (1989). A practical English grammar: Exercises 2 (Ed. 3.). Oxford Univ. Press.

THOMSON, A.J, and A.V MARTINET. A Practical English Grammar: Exercises 2. Ed. 3. Oxford: Oxford Univ. Press, 1989.

THOMSON, A.J, and A.V MARTINET. A Practical English Grammar: Exercises 2. Ed. 3. Oxford Univ. Press, 1989.