Seliger, H. W. (1989). Second language research methods. Oxford, UK: Oxford University Press.
Dyfyniad Arddull ChicagoSeliger, Herbert W,Seliger. Second Language Research Methods. Oxford, UK: Oxford University Press, 1989.
Dyfyniad MLASeliger, Herbert W,Seliger. Second Language Research Methods. Oxford, UK: Oxford University Press, 1989.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.