1. Adams, E. N., Technical considerations in the design of a CAI system, Programmed Learning. 9(5):256–271.
2. Alpert, D., and Bitzer, D. L., 1970. Advances in computer-based education, Science, 167: 1582–1590.
3. Anastasio, E. J., and Morgan, J. S., 1972. Study of Factors that have Inhibited a More Widespread Use of Computers in the Instructional Process, EDUCOM, Interuniversity Communications Council, Inc., Princeton, New Jersey.
4. Barnett, M., 1971. An Introduction to FOIL Programming in MTS, Center for Research on Learning and Teaching, University of Michigan, Ann Arbor, Michigan.
5. Bates, F., and Douglas, M. L., 1967. Programming Language/One, Prentice-Hall, Englewood Cliffs, New Jersey.