1. See for example: Rose, G., Barker , D.J.P.; Epidemiology for the Uninitiated, pp. 18-24, 1979, British Medical Association .
2. Hamilton, D., Curriculum Evaluation p. 12. 1976 Open Books.
3. Stenhouse, L., An Introduction to Curriculum Research and Development. p. 96, 112. 1975. Heinemann