Swan, M., & Smith, B. (1987). Learner English: A teacher's guide to interference and other problems. Cambridge University Press.
Lua i Stíl Chicago (17ú heag.)Swan, Michael, agus Bernard Smith. Learner English: A Teacher's Guide to Interference and Other Problems. Cambridge, UK: Cambridge University Press, 1987.
Lua MLA (9ú heag.)Swan, Michael, agus Bernard Smith. Learner English: A Teacher's Guide to Interference and Other Problems. Cambridge University Press, 1987.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.