Cita APA (7th ed.)

Swan, M. (1995). Practical English usage (2nd ed.). Oxford University Press.

Cita Chicago (17th ed.)

Swan, Michael. Practical English Usage. 2nd ed. Oxford: Oxford University Press, 1995.

Cita MLA (9th ed.)

Swan, Michael. Practical English Usage. 2nd ed. Oxford University Press, 1995.