APA (7th ed.) Citation

Swan, M. (1981). Practical english usage. Oxford Univ. Press.

Chicago Style (17th ed.) Citation

Swan, Michael. Practical English Usage. Oxford: Oxford Univ. Press, 1981.

MLA (9th ed.) Citation

Swan, Michael. Practical English Usage. Oxford Univ. Press, 1981.

Warning: These citations may not always be 100% accurate.