Richards, J. C., Hull, J., & Proctor, S. (2005). Interchange: Teacher's edition (tercera edición.). Cambridge University Press.
Chicago Style (17th ed.) CitationRichards, Jack C., Jonathan Hull, and Susan Proctor. Interchange: Teacher's Edition. tercera edición. Cambridge: Cambridge University Press, 2005.
MLA citiranjeRichards, Jack C., et al. Interchange: Teacher's Edition. tercera edición. Cambridge University Press, 2005.
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