AndersonJDayJ LDowlingM A CPettingaleK W. (1970) Postgraduate Medical Journal46, 606–612
2.
BriggsL JCampeauP LGagnéR MMayM A. (1967) Instructional Media: A Procedure for the Design of Multi-media Instruction, a Critical Review of Research and Suggestions for Future Research. American Institutes for Research, Pittsburgh, Pa
3.
EngelC E. (1963) Nature (London)200, 725–728
4.
EngelC E. (1966) In: Teaching Methods in University Departments of Science and Medicine. Ed. BeardR M. Institute of Education, London; pp 11–17
5.
EngelC E. (1970) Update2, 647–648
6.
EngelC E. (1971) Medical and Biological Illustration21, 14–18
7.
VerbrughH Sde VriesM JEasthamN W. (1971) Lanceti, 228–229
