1. Ainsworth, S. E., Bibby, P. A., & Wood, D. J. (1997). Information technology and multiple representations: New opportunities—New problems. Technology Pedagogy and Education, 6(1), 93–105.
2. Arzarello, F., Olivero, F., Paola, D., & Robutti, O. (2002). A cognitive analysis of dragging practises in Cabri environments. ZDM, 34(3), 66–72.
3. Balacheff, N., & Gaudin, N. (2002). Students’ conceptions: An introduction to a formal characterization. Les Cahiers du Laboratoire Leibniz 65.
4. Balzer, W. K., Doherty, M. E., & O’ Connor, R. (1989). Effects of cognitive feedback on performance. Psychological Bulletin, 106, 410–433.
5. Bernstein, B. (2000). Pedagogy, symbolic control and identity: Theory, research and critique. Lanham: Rowman and Littlefield. (revised ed.).