Richards, J. C., Hull, J., & Proctor, S. (1997). New interchange 1: English for international communication : workbook. Cambridge: Cambridge University Press.
Stile di citazione ChicagoRichards, Jack C., Jonathan Hull, e Susan Proctor. New Interchange 1: English for International Communication : Workbook. Cambridge: Cambridge University Press, 1997.
Citazione MLARichards, Jack C., Jonathan Hull, e Susan Proctor. New Interchange 1: English for International Communication : Workbook. Cambridge: Cambridge University Press, 1997.
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