4[1]Stephen W.Harmon,Marshall G.Jones: The Five Levels of Web Use in Education:Factors to Consider in Planning Online Courses, Educational Technology,Nov.-Dec.1999.
5[2]Viviane Reding, 2000, Europe's competitive position in the Internet-based economy,Internet european Summit, Madrid,11 Jan.,2000.
6[3]Detlef Clowe, Proposal on Pilot project on E-Learning, Swedec InternationalAB,2000,3, Sweden.
