Cita APA (7a ed.)

Swan, M., & Smith, B. (2001). Learner english: A teacher's guide to interference and other problems (2nd ed.). University Press.

Cita Chicago Style (17a ed.)

Swan, Michael, y Bernard Smith. Learner English: A Teacher's Guide to Interference and Other Problems. 2nd ed. Cambridge [etc.]: University Press, 2001.

Cita MLA (9a ed.)

Swan, Michael, y Bernard Smith. Learner English: A Teacher's Guide to Interference and Other Problems. 2nd ed. University Press, 2001.