Association for Programmed Learning and Educational Technology, Leedham, J., & Clarke, J. (1976). Educational technology for individualised learning. Kogan Page.

Association for Programmed Learning and Educational Technology, John Leedham, and John Clarke. Educational Technology for Individualised Learning. London: Kogan Page, 1976.

Association for Programmed Learning and Educational Technology, et al. Educational Technology for Individualised Learning. Kogan Page, 1976.