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3. Bridges, E., & Hallinger, P. (1992). Problem-based Learning for Administrators. Eugene, OR: ERIC Clearinghouse on Educational Management.
4. Cohen, J. (1988). Statistical Power Analysis for Behavioral Sciences. (3rd ed.). Hillsdale, NJ: Erlbaum.
5. Effectiveness of problem-based learning curricula: Research and theory;Culver;Academic Medicine.,2000