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5Fischer, F. C. & Mandl, H. (2000). Fostering problem - oriented learning with auxiliary hypertext and graphical information. Paper presened at the Annual Meeting of the American Educational Research Association, New Orleans, LA. (April 24- 28,2000) (ERIC Document Reproduction Service No. ED 444 988).
6Laffey,J. Tupper,T., Musser,D. &Wedman,J. (1998). A computer- mediated support system for project - based learning. Educational Technology Research& Development, 46 (1), 73 - 86.
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8Blumenfeld,P.C., Soloway, E., Marx,R. W., Krajcik,J.S., Guzdial, M.,& Palincsar, A.(1991). Motivating project-based learning: Sustaining the doing, supporting the learning. Educational Psychologist, 26(3-4), 369-389
9Fischer, F., C., & Mandl,H.(2000). Fostering problem-oriented learning with auxiliary hypertext and graphical information. Paper presened at the Annual Meeting of the American Educational Research Association, New Orleans, LA.(April 24-28,2000)(ERIC Document Reproduction Service No. ED 444 988)
10Laffey,J., Tupper,T., Musser, D., &Wedman,J.(1998). A computer-mediated support system for project-based learning. Educational Technology Research& Development, 46(1),73-86
