Richards, J. C., Hull, J., & Proctor, S. (1997). New Interchange Vol. 1: English for international communication. Cambridge University Press.

Richards, Jack C., Jonathan Hull, and Sussan Proctor. New Interchange Vol. 1: English for International Communication. Cambridge: Cambridge University Press, 1997.

Richards, Jack C., et al. New Interchange Vol. 1: English for International Communication. Cambridge University Press, 1997.