Swan, M., & Smith, B. (1987). Learner English : a teacher's guide to interference and other problems / Michael Swan and Bernard Smith: A teacher's guide to interference and other problems. Cambridge University Press.
Chicago Style (17th ed.) CitationSwan, Michael, and Bernard Smith. Learner English : A Teacher's Guide to Interference and Other Problems / Michael Swan and Bernard Smith: A Teacher's Guide to Interference and Other Problems. Cambridge: Cambridge University Press, 1987.
MLA (9th ed.) CitationSwan, Michael, and Bernard Smith. Learner English : A Teacher's Guide to Interference and Other Problems / Michael Swan and Bernard Smith: A Teacher's Guide to Interference and Other Problems. Cambridge University Press, 1987.
Warning: These citations may not always be 100% accurate.