1. Ausubel, D. P. (1968).Educational Psychology.New York: Holt Rinehart and Winston
2. Berry, C. (1988). ‘Memory studies and broadcast messages’ in M. M. Gruenberg (ed),Practical Aspects of Memory: Current Research and Issues (Vol 1: Memory in everyday life), Chichester: Wiley, pp 435–439
3. Trends in research on the adult learner
4. Self-Directed Adult Learning: A Critical Paradigm
5. Self-directed learning: A critical review of research