7[3]Weisbrod,Burton.Toward a Theory of the Voluntary Non profit Sector in Three-Sector Economy .In E.Phelps.eds. Altruism Morality and Economic Theory[M].New York:Russel Sage.1974.
8James E. Grunig (ed.), Excellence in Public Relations and Communication Management [M] . Hillsdale, NJ:Lawrence Erlbaum Associates, 1992.
9Herbert Blumer. The Mass,The Public and Public Opinion [A]. in Bernard Berelson ( ed. ). Reader in Public Opinion and Communication, 2nd ed [C] . New York:Free Press, 1966.
10Carroll J. Glynn. Public Opinion as a Normative Opinion Process [A] . Communication Yearbook, Vol. 20 [C].Thousand Oaks. CA.: Sage Publications, 1997.
