Richards, J. C., & Jack C.Richards. (1990). The language teaching matrix. New York: Cambridge University Press.
Dyfyniad Arddull ChicagoRichards, Jack C., và Jack C.Richards. The Language Teaching Matrix. New York: Cambridge University Press, 1990.
Dyfyniad MLARichards, Jack C., và Jack C.Richards. The Language Teaching Matrix. New York: Cambridge University Press, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.