1. Ausubel, D. (1968).Educational Psychology: A Cognitive View Holt, Reinhart & Winston, New York.
2. Boyle, S. (1989).The Greenhouse Effect Hodder & Stoughton, London.
3. Child, D. (1979).The Essentials of Factor Analysis Holt, London.
4. Gates, P. (1992).The Aliens are Coming ? Plant Life and the Greenhouse Effect Puffin Books, London.
5. Gribbin, J. (1990). An assault on the climate consensus.New Scientist December 15, 1990: pp. 26?31.