APA (7th ed.) Zitazioa
Richards, J. C. (2002). Changes: English for international communication. Cambridge university press.
Chicago Style (17th ed.) Zitazioa
Richards, Jack C. Changes: English for International Communication. Cambridge: Cambridge university press, 2002.
MLA (9th ed.) Zitazioa
Richards, Jack C. Changes: English for International Communication. Cambridge university press, 2002.
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