APA (7th ed.) Citation

Swan, M., & Walter, C. (2001). How English works: A grammar practice book. Oxford University Press.

Chicago Style (17th ed.) Citation

Swan, Michael, and Catherine Walter. How English Works: A Grammar Practice Book. Oxford: Oxford University Press, 2001.

MLA (9th ed.) Citation

Swan, Michael, and Catherine Walter. How English Works: A Grammar Practice Book. Oxford University Press, 2001.