Goldstein, L. S., & Gotkin, L. G. (1962). A review of research: Teaching machines vs. programmed textbooks as presentation modes. Center for Programed Instruction.

Goldstein, Leo S., and Lassar G. Gotkin. A Review of Research: Teaching Machines Vs. Programmed Textbooks as Presentation Modes. N.Y.: Center for Programed Instruction, 1962.

Goldstein, Leo S., and Lassar G. Gotkin. A Review of Research: Teaching Machines Vs. Programmed Textbooks as Presentation Modes. Center for Programed Instruction, 1962.