APA (7th ed.) Citation

Richards, Hull, & Proctor. (1996). Changes: English for international communications 3 teacher's book. Cambridge University Press.

Chicago Style (17th ed.) Citation

Richards, Hull, and Proctor. Changes: English for International Communications 3 Teacher's Book. UK: Cambridge University Press, 1996.

MLA (8th ed.) Citation

Richards, et al. Changes: English for International Communications 3 Teacher's Book. Cambridge University Press, 1996.