Thomson, A. J., & Martinet, A. V. (1969). A practical english grammar (2a. ed.). Oxford University Press.

Thomson, A. J., and André V. Martinet. A Practical English Grammar. 2a. ed. Oxford: Oxford University Press, 1969.

Thomson, A. J., and André V. Martinet. A Practical English Grammar. 2a. ed. Oxford University Press, 1969.