Dyfyniad APA

Nichols, R. G., & Stevens, L. A. (1957). Are you listening? McGraw-Hill.

Dyfyniad Arddull Chicago

Nichols, Ralph G., and Leonard A. Stevens. Are You Listening? New York: McGraw-Hill, 1957.

Dyfyniad MLA

Nichols, Ralph G., and Leonard A. Stevens. Are You Listening? McGraw-Hill, 1957.

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