APA (7th ed.) Citation

Swan, M. (1995). Practical english usage (2a. ed.). Oxford University Press.

Chicago Style (17th ed.) Citation

Swan, Michael. Practical English Usage. 2a. ed. Oxford: Oxford University Press, 1995.

MLA (9th ed.) Citation

Swan, Michael. Practical English Usage. 2a. ed. Oxford University Press, 1995.