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Dyfyniad Arddull ChicagoGASS, Susan M. [ ed.]. Linguistic Perspectives on Second Language Acquisition. New York: Cambridge Univ. Press, 1990.
Dyfyniad MLAGASS, Susan M. [ ed.]. Linguistic Perspectives on Second Language Acquisition. Cambridge Univ. Press, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.