APA (7th ed.) Citation

O'Sullivan, Swan, & Walter. (1993). The new Cambridge english cource practice 4: Upper-intermediate. Cambridge University Press.

Chicago Style (17th ed.) Citation

O'Sullivan, Swan, and Walter. The New Cambridge English Cource Practice 4: Upper-intermediate. Petaling Jaya: Cambridge University Press, 1993.

MLA (8th ed.) Citation

O'Sullivan, et al. The New Cambridge English Cource Practice 4: Upper-intermediate. Cambridge University Press, 1993.