1. Kulik J. A., The Encyclopedia of Educational Research (Fifth edition), Vol. II, Mitzel H. (ed.), MacMillan, New York, pp. 851–858, 1983.
2. Next Year, Jerusalem! The Rise of Educational Technology
3. Silberman H. F., Programmed Learning and Computer-based Instruction, Coulson J. E. (ed.), Wiley, New York, pp. 13–24, 1962.