Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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