1. Baggett, P. (1988). The role of practice in videodisc-based procedural instructions.IEEE Transactions on Systems, Man, and Cybernetics 18: 487?496.
2. Best, J.B. (1989).Cognitive psychology. St. Paul: West.
3. Bork, A. (1982). Interactive learning. In R. Taylor, ed.,The Computer in the School: Tutor, Tool, Tutee. New York: Teachers College.
4. Bork, A. (1985).Children, Computers, and the Future of Education. Irvine, CA: Educational Technology Center, University of California at Irvine.
5. Broadbent, D. (1958).Perceptions and Communication. London: Pergammon Press.