Verderber, R. F. (1979). The challenge of effective speaking (4th ed.). Wadsworth Pub. Co..
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Dyfyniad Arddull Chicago
Verderber, Rudolph F. The Challenge of Effective Speaking. 4th ed. Belmont, Calif.: Wadsworth Pub. Co., 1979.
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Dyfyniad MLA
Verderber, Rudolph F. The Challenge of Effective Speaking. 4th ed. Wadsworth Pub. Co., 1979.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.