1. Adey, P., & Shayer, M. (1993). An exploration of long-term far-transfer effects following an extended intervention program in the high school science curriculum. Cognition and Instruction, 11(1), 1–29.
2. Bell, A. (1993). Principles for the design of teaching. Educational Studies in Mathematics, 24, 5–34.
3. Bell, A. (1994). Teaching for the test. In S. Selinger (Ed.), Teaching Mathematics (pp. 41–46). London: The Open University in association with Routledge.
4. Benbow, R. M. (1993). Tracing mathematical beliefs of prospective teachers through integrated content method courses. In Proceedings of annual conference of the American educational research association. ERIC Document Reproduction Service No. ED 388638.
5. Berlyne, D. E. (1965). Curiosity and education. In J. Krumboltz (Ed.), Learning and the educational process. Chicago: Rand-McNally.