1. LOGO Memo;H. Abelson,1974
2. Alpert, D., and Bitzer, D. L. (1970). ?Advances in computer-based education?, Science, 167, 1582?1590.
3. Bruner, J. (1973). Beyond the Information Given. New York: Norton.
4. Crowder, N. A. (1960). ?Automatic tutoring by intrinsic programming?, in Lumsdaine, A. A., and Glaser, R., Eds., Teaching Machines and Programmed Learning: A Science Book. Washington, D. C.: National Education Association, Department of Audio-Visual Instruction.
5. Feurzeig, W. (1971). Automated Instructional Monitors for Complex Operational Tasks. Cambridge, Mass.: Bolt, Beranek and Newman, Report No. 2272, October.