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2. More colleges plunging into uncharted waters of on-line courses;Arenson;New York Times,1998
3. Asynchronous learning networks as a virtual classroom;Hiltz;Communications of the ACM,1997
4. Distance education compared to traditional instruction: The student's view;Homan;International Journal of Instructional Media,1997
5. What's the difference? A review of contemporary research on the effectiveness of distance learning in higher education,1999