3Perya, D. Distance Education and the WWW, http : / / tecfa. unige, ch/edu - comp/edu - ws94/contrib/peraya. fm. html, 1993.
4Bonk, C.J. & Cummings,J. A. A Dozen Recommendations for Placing the Student at the Centre of WebBased Learning [J]. Educational Media International (EMI) ,1997,35(2) :82-89.
5Collis. B. Pedagogical Re-Engineering : A Model for the Analysis and Redesign of Courses for the WWW, http://www, to. utwente, nl/user/ism/Collis/presents/ Finland/menu. htm, 1997.
6Chee,Y. S. Web-based Learning: Pedagogical Approaches to the Use of Media and their Learning Effects [A]. In:Proceedings of ICCE'98, Vol . 1. Beijing, 1998 : 101-107.
7Bostock,S. J. Design Web-Based Instruction for Active Learning, http://www, keele, ac. uk/depts/cs/Stephen_Bostock/wbi. html, 1997.
9Ritland, B. B.& Harvey, D. M. A General Framework for the Development of Web-Based Instruetion[J]. Educational Media International(EMI), 1997,35 (2) : 77 - 81.
10Ritchie,D. C.& Hoffman,B. Incorporating Instructional Design Principles with the World Wide Web, http:// edweb, sdsu. edu/people/DRithie/Drithie, html , 1996.