Richards, J. C. (1998). New interchange intro: Class audio cassettes [Băng Casset]. Cambridge: Cambridge University Press.
Παραπομπή Chicago StyleRichards, Jack C. New Interchange Intro: Class Audio Cassettes [Băng Casset]. Cambridge: Cambridge University Press, 1998.
Παραπομπή MLARichards, Jack C. New Interchange Intro: Class Audio Cassettes [Băng Casset]. Cambridge: Cambridge University Press, 1998.
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