4Thomas Winard & Stuart C. Browon. "The One and the Many:A Brief History of the Distinction" in A Sence of Audience in Written Communication edited by Gesa Kirsch & Duane H. Roen.Sage Publications, 1990.
5Stephen W.Littlejohn.Theories of Human Communication.second ed. Wadsworth, Inc., 1983.
10Thomas Willard, Smart C. Browon. The One and the Many: A Brief History of the Distinction[A]. Gesa Kirsch, Duane H. Roen. A Sense of Audience in Written Communication[C]. Sage Publications, 1990: 46.