1. Adams, D., Carlson, H., & Hamm, M. (1990).Cooperative learning and educational media: Collaborating with technology and each other. Englewood Cliffs, NJ: Educational Technology Publications.
2. Ary, D., Jacobs, L. C., & Razavieh, A. (1985).Introduction to research in education, (3rd ed.) New York: Holt, Rinehart and Winston.
3. Bennett, J. L. (1972). The user interface in interactive systems.Annual Review of Information Science and Technology, 7, 159–196.
4. Carlitz, R. D. (1991). Common knowledge: Networks of kindergarten through college.Educom Review, 26(2), 25–28.
5. Castle, S., & Arends, R. I. (1992).The practice of teaching: Cooperative learning. (ERIC Document Reproduction Service No. ED 350 277)