1. Ball, H. G. (1978). Telegrams teach more than you think.Audiovisual Instruction. 24–26.
2. Ball, S., & Bogatz, G. A. (1970).The first years of sesame street: An evaluation. Princeton, N.J.: Educational Testing Service.
3. Bennet, G. K., Seashore, H. G., & Wesman, A. G. (1974).Manual for the Differential Aptitude Tests: Forms S and T. 5th ed. New York: The Psychological Corporation.
4. Blakeman, M. (1982, October a). Studies in video: games and brain-damaged patients.Playmeter.
5. Blakeman, M. (1982), December b). Studies in video: stretch, games exercise mental abilities.Playmeter.