References
- Ayalon, M., Lerman, S., & Watson, A. (2013). Development of students' understanding of functions throughout school years. Proceedings of the British Society for Research into Learning Mathematics, 33(2), 7–12.
- Eisenberg, T. (1991). Functions and associated learning difficulties. In D. Tall (Ed.), Advanced mathematical thinking (pp. 140–152). Dordrecht: Kluwer.
- Leinhardt, G., Zaslavsky, O., & Stein, M. K. (1990). Functions, graphs and graphing: Tasks, learning, and teaching. Review of Educational Research, 60(1), 1–64. doi:10.3102/00346543060001001
- Swan, M. (1980). The language of functions and graphs. Nottingham: Shell Centre for Mathematical Education, University of Nottingham.