1. Crowder, H. “ Teaching MachinesAre a Threat to Teachers.”School Management 4:41–43; December 1960.
2. DAVI of NEA.Teaching Machines and Programmed Learning. Film issued by Norwood Studios, Inc., 926 New Jersey Avenue, N.W., Washington 1, D. C. $60.50.
3. Finn, J. D. “ Technology and the Instructional Process.”Phi Delta Kappan 41:371–378; June 1960.
4. Finn, J. D. and Perrin, D. G.Teaching Machines and Programmed Learning, 1962:A Survey of the Industry. Occasional Paper #3, Technological Development Project. Washington, D. C. : National Education Association.
5. Foltz, C. I.The World of Teaching Machines. Washington, D. C.: Electronic Teaching Laboratories, 1962. 116 p. $5.75.