Verderber, R. F. (1979). The challenge of effective speaking (4th ed.). Wadsworth Pub. Co..
芝加哥风格引文Verderber, Rudolph F. The Challenge of Effective Speaking. 4th ed. Belmont, Calif.: Wadsworth Pub. Co., 1979.
MLA引文Verderber, Rudolph F. The Challenge of Effective Speaking. 4th ed. Wadsworth Pub. Co., 1979.
警告：这些引文格式不一定是100％准确.