Cita APA (7a ed.)

Swan, M. (2003). Practical English usage (Fifth impression.). Oxford University Press.

Cita Chicago Style (17a ed.)

Swan, Michael. Practical English Usage. Fifth impression. Oxford ; New York: Oxford University Press, 2003.

Cita MLA (8a ed.)

Swan, Michael. Practical English Usage. Fifth impression. Oxford University Press, 2003.