APA (7th ed.) Citation

Swan, M., & Smith, B. (1987). Learner English: A teacher's guide to interference and other problems. Cambridge University Press.

Chicago Style (17th ed.) Citation

Swan, Michael, and Bernard Smith. Learner English: A Teacher's Guide to Interference and Other Problems. Cambridge: Cambridge University Press, 1987.

MLA (9th ed.) Citation

Swan, Michael, and Bernard Smith. Learner English: A Teacher's Guide to Interference and Other Problems. Cambridge University Press, 1987.