Cita APA (7th ed.)
Swan, M. (1984). Practical English usage (3rd ed.). Oxford University Press.
Cita Chicago (17th ed.)
Swan, Michael. Practical English Usage. 3rd ed. Oxford ; New York: Oxford University Press, 1984.
Cita MLA (9th ed.)
Swan, Michael. Practical English Usage. 3rd ed. Oxford University Press, 1984.
Atenció: Aquestes cites poden no estar 100% correctes.