Cita APA (7th ed.)
Swan, M. (2016). Practical english usage (4th ed.). Oxford University Press.
Cita Chicago (17th ed.)
Swan, Michael. Practical English Usage. 4th ed. United Kingdom: Oxford University Press, 2016.
Cita MLA (9th ed.)
Swan, Michael. Practical English Usage. 4th ed. Oxford University Press, 2016.
Atenció: Aquestes cites poden no estar 100% correctes.