APA (7th ed.) Zitazioa
Swan, M. (1984). Practical English usage (3rd ed.). Oxford University Press.
Chicago Style (17th ed.) Zitazioa
Swan, Michael. Practical English Usage. 3rd ed. Oxford ; New York: Oxford University Press, 1984.
MLA (9th ed.) Zitazioa
Swan, Michael. Practical English Usage. 3rd ed. Oxford University Press, 1984.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.