1. Alexander, R. (2001). Culture & pedagogy. International comparisons in primary education. Malden: Blackwell.
2. Ananiadou, K., & Claro, M. (2009). 21st century skills and competences for New Millennium Learners in OECD countries. Organization for Economic Cooperation and Development. EDU working paper no. 41. Retrieved from http://www.olis.oecd.org/olis/2009doc.nsf/linkto/edu-wkp(2009)20
3. Binkley, M., Erstad, O., Herman, J., Raizen, S., Ripley, M., Miller-Ricci, M., & Rumble, M. (2012). Defining twenty-first century skills. In P. Griffin, B. McGaw, & E. Care (Eds.), Assessment and teaching of 21st century skills (pp. 17–66). Dordrecht: Springer.
4. Bransford, J. D., Brown, A. L., & Cocking, R. R. (Eds.). (2000). How people learn. Brain, mind, experience, and school. Washington, DC: National Academy Press.
5. Bray, B., & McClaskey, K. (2013). Personalization v differentiation v individualization. Report (v2). Licensed under a creative commons atribution-nonCommercial-NoDerivs 3.0 Imported License.