APA (7th ed.) Citation

Swan & Walter, C. 1. (1997). How English works: A grammar practice book : with answers. Oxford University Press.

Chicago Style (17th ed.) Citation

Swan and Catherine( 1946-) Walter. How English Works: A Grammar Practice Book : With Answers. Oxford: Oxford University Press, 1997.

MLA (8th ed.) Citation

Swan and Catherine( 1946-) Walter. How English Works: A Grammar Practice Book : With Answers. Oxford University Press, 1997.