2Mayer F. Educational Psychology: A Cognitive Approach Boston: Little Brown.,1987,34-3
3Ausubel D. P. The Use of Advance Organizer in the Learning And Retention ofMeaningful Verbal Material. Journal of Educational Psychology, 1960, 51:267-272
4Ausubel D P, et al. Educational Psychology: A Cognitive View. 2nd. ed. New York:Holt, Rinehart & Winston Inc, 1978. 132-136
5Rogers C R. Freedom to Learning. 3rd ed. Ohiol: Merrill, 1983,67-71