Cita APA (7a ed.)
Swan, M. (1984). Practical English usage (3rd ed.). Oxford University Press.
Cita Chicago Style (17a ed.)
Swan, Michael. Practical English Usage. 3rd ed. Oxford ; New York: Oxford University Press, 1984.
Cita MLA (9a ed.)
Swan, Michael. Practical English Usage. 3rd ed. Oxford University Press, 1984.
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