APA (7th ed.) Citation

Richards, Hull, & Proctor. (1995). Changes: English for international communication 2 workbook. Cambridge University Press.

Chicago Style (17th ed.) Citation

Richards, Hull, and Proctor. Changes: English for International Communication 2 Workbook. UK: Cambridge University Press, 1995.

MLA (8th ed.) Citation

Richards, et al. Changes: English for International Communication 2 Workbook. Cambridge University Press, 1995.