(2001). Learner English: A teacher's guide to interference and other problems. Cambridge, UK: Cambridge University Press.
Dyfyniad Arddull ChicagoLearner English: A Teacher's Guide to Interference and Other Problems. Cambridge, UK: Cambridge University Press, 2001.
Dyfyniad MLALearner English: A Teacher's Guide to Interference and Other Problems. Cambridge, UK: Cambridge University Press, 2001.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.