1. Aziz, A., & Zargar, B. A. (1998). On the critical points of a polynomial.Bulletin of the Australian Mathematical Society, 57, 173–174.
2. Biggs, J., & Collis, K. F. (1982).Evaluating the quality of learning: The SOLO taxonomy (Structure of the Observed Learning Outcome). New York, NY: Academic Press.
3. Biggs, J., & Collis, K. F. (1989). Towards a model of school-based curriculum development and assessment using the SOLO taxonomy.Australian Journal of Education, 33, 151–163.
4. Campbell, K. J., Watson, J. M., & Collis, K. F. (1992). Volume measurement and intellectual development.Journal of Structural Learning, 11, 279–298.
5. Case, R. (1985).Intellectual development: Birth to adulthood. Orlando, FL: Academic Press.