APA (7th ed.) Citation

Swan & Walter. (1997). How english works: Grammar practice book with answers. Oxford University Press.

Chicago Style (17th ed.) Citation

Swan and Walter. How English Works: Grammar Practice Book with Answers. Oxford: Oxford University Press, 1997.

MLA (9th ed.) Citation

Swan and Walter. How English Works: Grammar Practice Book with Answers. Oxford University Press, 1997.

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