2Jonassen, D., K. Peck & B. Wilson (1999). Learning with Technology: A Constructivist Perspective. NJ: Prentice Hall. p. 194.
3Cognition and Technology Group at Vanderbilt (1992). The Jasper Experiment: An exploration of issues in learning and instructional design. In M. Rannafin & S. Hooper (Eds.), Educational Technology Research and Development, 40 (1), 65-80.
4Rogers, C. R. (1983). Freedom to Learn for the 80's. Columbus: Merrill. p.31.
