Programmed Learning Conference Loughborough, England, Leicestershire Programmed Learning Group, Association for Programmed Learning, Unwin, D., & Leedham, J. (1967). Aspects of educational technology: The proceedings of the Programmed Learning Conference held at Loughborough, 15-18 April 1966. Methuen.

Programmed Learning Conference Loughborough, England, Leicestershire Programmed Learning Group, Association for Programmed Learning, Derick Unwin, и John Leedham. Aspects of Educational Technology: The Proceedings of the Programmed Learning Conference Held at Loughborough, 15-18 April 1966. London: Methuen, 1967.

Programmed Learning Conference Loughborough, England, et al. Aspects of Educational Technology: The Proceedings of the Programmed Learning Conference Held at Loughborough, 15-18 April 1966. Methuen, 1967.