9Bemath, U., Kleinschmidt, A., Wahi, C., Zawacki, O., and Ossietzky, C. Challenges for Study Centers in an Electronic Age: A case study of the Center for Distance Education at Carlvon Ossietzky University of Oldenburg in Germany [J]. International Review of Research in Open and Distance Learning, 2003, (4).
10Belanger, F. and Dianne, H. Evaluation and Implementation of Distance Learning: Technologies, Tools and Techniques [M]. London: Idea Group Publishing, 2000.
