Cita APA (7a ed.)
Swan, M., & Walter, C. (1997). How English Works: A grammar practice book (3.Ed.). The University Press.
Cita Chicago Style (17a ed.)
Swan, Michael, y Catherine Walter. How English Works: A Grammar Practice Book. 3.Ed. Oxford: The University Press, 1997.
Cita MLA (9a ed.)
Swan, Michael, y Catherine Walter. How English Works: A Grammar Practice Book. 3.Ed. The University Press, 1997.
Precaución: Estas citas no son 100% exactas.