Cita APA (7a ed.)
Swan, M. (2016). Practical english usage (4th ed.). Oxford University Press.
Cita Chicago Style (17a ed.)
Swan, Michael. Practical English Usage. 4th ed. United Kingdom: Oxford University Press, 2016.
Cita MLA (9a ed.)
Swan, Michael. Practical English Usage. 4th ed. Oxford University Press, 2016.
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