1. Arcavi, A. (2003). The role of visual representations in the learning of mathematics. Educational Studies in Mathematics, 52, 215–241.
2. Bartolini Bussi, M. G., & Mariotti, M. A. (2008). Semiotic mediation in the mathematics classroom: Artifacts and signs after a vygotskian perspective. In L. English, M. Bartolini Bussi, G.Jones, R. Lesh, and D. Tirosh. (Eds.), Handbook of International Research in Mathematics Education. (pp. 746–805). Second revised edition. Lawrence Erlbaum, Mahwah, NJ.
3. Bishop, A. (1991). Mathematical enculturation: A cultural perspective on Mathematics Education. Dordretcht: Kluwer Academic Publishers.
4. Brown, K., & Cole, M. (2000). Socially shared cognition: System design and the organization of collaborative research. In D.H. Jonassen and S.M. Land (Eds.), Theoretical Foundations of Learning Environments. Lawrence Erlbaum, p. 197–214.
5. Casselman, B. (2000). Pictures and proofs. Notices of the AMS, 47(10), 1257–1266.