1Moore,M.C.&Kearsley,G.(1996).Distance Education:a System View.Belmont,CA:Wedsworth.
2Williams F.,(1998).Research Methods and the New Media.New York:The Free Press.
3Moore,M.C.(1993).Theory of Transactional Distance.In Keegan (Ed.),Theoretical Principle of Distance Education,London:Routledge.
4Vrasidas,C.,&Mclsaac,M.(1999).Factors Influencing Interaction in an On-line Course.The American Journal Distance Education.
5Rafaeli,S.(1988).Interactivity:From new media to communication.In R.Hawkin,J.Weimann,& S.Pingree (Eds.),Advancing Communication Science:Merging mass and interpersonal processes (pp.110-134).Newbury park,CA:Sage.
6Li,Xigen.(1998).Web page design and graphic use of three U.S.newspapers.Journalism & Mass Communication Quarterly 75,353-65.
7Paul,M.J.(2001).Interactive disaster communication on the internet:a content analysis of sixty-four disaster relief home pages.Journalism & Mass Communication Quarterly 78 (winter 2001) 739-753.
