Cita APA (7th ed.)

Swan, M. (2005). Practical english usage (Third edition.). Oxford University Press.

Cita Chicago (17th ed.)

Swan, Michael. Practical English Usage. Third edition. Oxford, New York: Oxford University Press, 2005.

Cita MLA (8th ed.)

Swan, Michael. Practical English Usage. Third edition. Oxford University Press, 2005.