Programmed Learning and Computer-based Instruction, ed. by Coulson, John Wiley & Sons, NY, 1962

• Bitzer, D.L., W. Lichtenberger & P.G. Braunfeld, (1962) Bitzer, D.L., W. Lichtenberger & P.G. Braunfeld, "PLATO II: A multiple-student computer controlled teaching machine"