Cita APA (7a ed.)

Swan, M. (2016). Practical English usage (Fourth edition.). Oxford University Press.

Cita Chicago Style (17a ed.)

Swan, Michael. Practical English Usage. Fourth edition. Oxford, United Kingdom: Oxford University Press, 2016.

Cita MLA (9a ed.)

Swan, Michael. Practical English Usage. Fourth edition. Oxford University Press, 2016.