1. Adams, R.A. (2006, 2003). Calculus. A complete course. Toronto, Canada: Pearson.
2. Alsina, C. (2001). Why the professor must be a stimulating teacher? In D. Holton (Ed.), The teaching and learning of mathematics at university level: an ICMI Study (pp. 3–12). Dordrecht, The Netherlands: Kluwer Academic Publishers.
3. Artigue, M. (1994). Didactical engineering as a framework for the conception of teaching products. In R. Biehler, R. W. Scholtz, R. Strasser, & B. Winkelmann (Eds.), Didactics of mathematics as a scientific discipline (pp. 27–39). Dordrecht, The Netherlands: Kluwer Academic Publisher.
4. Artigue, M. (2001). What can we learn from educational research at the university level? In D. Holton (Ed.), The teaching and learning of mathematics at university level: an ICMI Study (pp. 207–220). Dordrecht, The Netherlands: Kluwer Academic Publisher.
5. Bryman, A. (2004). Social research methods. Oxford, UK: Oxford University Press.