1. Achilles, C. M., & Hoover, S. P. (1996, November). Exploring problem-based learning (PBL) in grades 6-12. Paper presented at the annual meeting of the Mid-South Educational Research Association, Tuscaloosa, AL.
2. Ames, C., & Archer, J. (1988). Achievement goals in the classroom: Student learning strategies and motivation processes. Journal of Educational Psychology, 80, 260-267.
3. Barlia, L., & Beeth, M. E. (1999, March). High school students' motivation to engage in conceptual change learning in science. Paper presented at the annual meeting of the National Association for Research in Science Teaching, Boston.
4. Barrows, H. S. (1986). A taxonomy of problem-based learning methods. Medical Education, 20, 481-486.
5. Curry, J. J. (2002). Problem-based learning pathway student handbook. Columbus: The Ohio State University, College of Medicine and Public Health.