8Collins, R. ( 1979 ). The sredential society [ M ]. San Diego: Academic Press, INC.
9Daniel, J. (2003). Mega-universities : Mega-impact on access cost and quality [ OB/OL]. Retrieved May10,2011 from http://portal unesco, org/education/en/ev, php-URL_ ID = 26277&URL_ DO = DO TOPIC&URL_SECTION = 201. html.
10Holmberg, B. (1983). Guided didactic conversation in dis- tance education[ A]. D. Sewart, D. Keegan, and B. Holmberg (Eds.). Distance education: International perspeetives [ C ]. London: Croom Helm.
