(1984). Language testing. Edward Arnold.
Dyfyniad Arddull ChicagoLanguage Testing. London: Edward Arnold, 1984.
Dyfyniad MLALanguage Testing. Edward Arnold, 1984.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
(1984). Language testing. Edward Arnold.
Dyfyniad Arddull ChicagoLanguage Testing. London: Edward Arnold, 1984.
Dyfyniad MLALanguage Testing. Edward Arnold, 1984.