3Botes, A. W. (1995) Technology, open Learning and Distance Education. London and New York; Routledge. 被引量:1
4Coldeway, D. O. Devlin, L. E. & Holmberg, B.(1989) Distance education as a discipline; A Debete. Journal of Distance Education/Revue de I' Education a distance, Ⅳ, Ⅰ , 54-56. 被引量:1