1. Anderson, J. R. (2000).Cognitive psychology and its implications (5th ed.). New York: Freeman.
2. Ball, D. L., & McDiarmid, G. W. (1990). The subject-matter preparation of teachers. In W. R. Houston (Ed.),Handbook of research on teacher education. New York: MacMillan.
3. Chinnappan, M. (1998). The accessing of geometry schemas by high school students.Mathematics Education Research Journal, 10(2), 27–45.
4. Cottrill, J., Dubinsky, E., Nichols, D., Schwingendorf, K., Thomas, K., & Vidakovic, D. (1996). Understanding the limit concept: Beginning with a coordinated process scheme.Journal of Mathematical Behavior, 15, 167–192.
5. Davis, G., & Tall, D. O. (2002). What is a scheme? In D. O. Tall & M. O. J. Thomas (Eds.),Intelligence, learning and understanding in mathematics: A tribute to Richard Skemp (pp. 131–150). Flaxton, QLD: Post Pressed.