Cita APA (7a ed.)

Swan, M. (2005). Practical English usage (3rd ed.). Oxford University Press.

Cita Chicago Style (17a ed.)

Swan, Michael. Practical English Usage. 3rd ed. Oxford: Oxford University Press, 2005.

Cita MLA (9a ed.)

Swan, Michael. Practical English Usage. 3rd ed. Oxford University Press, 2005.