APA (7th ed.) Citation

Richards, J. C., Hull, J., & Proctor, S. (1990). Interchange: English for international communication. Workbook 1. Cambridge University.

Chicago Style (17th ed.) Citation

Richards, Jack C., Jonathan Hull, and Susan Proctor. Interchange: English for International Communication. Workbook 1. Cambridge: Cambridge University, 1990.

MLA (9th ed.) Citation

Richards, Jack C., et al. Interchange: English for International Communication. Workbook 1. Cambridge University, 1990.