Dyfyniad APA

Nichols, R. G., & Stevens, L. A. (1957). Are you listening? (ed.). Mc Graw Hill Book Co..

Dyfyniad Arddull Chicago

Nichols, Ralph G., and Leonard A. Stevens. Are You Listening? ed. New York: Mc Graw Hill Book Co., 1957.

Dyfyniad MLA

Nichols, Ralph G., and Leonard A. Stevens. Are You Listening? ed. Mc Graw Hill Book Co., 1957.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.