8Bimber,B.(2001).Information and civic engagement in America:The search for political effects of the Internet.Political Research Quarterly,54 (1),53-67.
10Lazarsfeld,P.,& Menzel,H.(1974).Mass media and personal influence.In W.Schramm (Ed.) The Science of Human Communication (pp.94-115).New York:Basic Books.
6Pang X,Zhu Z,Xu F,Guo J,Gong X,Liu D,Liu Z,Chin DP,Feikin DR. Evaluation of control measures implemented in the severe acute respiratory syndrome outbreak in Beijing [J]. 2003. JAMA. 2003 Dec 24,290(24):3215-21.
7Mnaning FJ, Goldfrank LR. Preparing for Terrorism: Tools for Evalu- ating the Metropolitan Medical Response System Program Washing- ton, D C: National Academy Press [J]. 2002,34-35.