APA (7th ed.) Citation

Richards, Hull, & Proctor. (1995). Changes: 2 class cassette set A. Cambridge University Press.

Chicago Style (17th ed.) Citation

Richards, Hull, and Proctor. Changes: 2 Class Cassette Set A. UK: Cambridge University Press, 1995.

MLA (8th ed.) Citation

Richards, et al. Changes: 2 Class Cassette Set A. Cambridge University Press, 1995.