Richards, J. C., Hull, J., & Proctor, S. (1997). New interchange: English for international communication: level 1 student's book. Cambridge University Press.

Richards, Jack C., Jonathan Hull, and Susan Proctor. New Interchange: English for International Communication: Level 1 Student's Book. Cambridge: Cambridge University Press, 1997.

Richards, Jack C., et al. New Interchange: English for International Communication: Level 1 Student's Book. Cambridge University Press, 1997.