1. Baroody, A. J., Ginsburg, H. P., & Waxman, B. (1983). Children’s use of mathematical structure. Journal for Research in Mathematics Education, 14(3), 156–168.
2. Bastable, V., & Schifter, D. (2008). Classroom stories: Examples of elementary students engaged in early algebra. In J. Kaput, D. W. Carraher, & M. L. Blanton (Eds.), Algebra in the early grades (pp. 165–184). Routledge.
3. Blanton, M., & Kaput, J. (2005). Characterizing a classroom practice that promotes algebraic reasoning. Journal for Research in Mathematics Education, 36(5), 412–446.
4. Blanton, M. L., & Kaput, J. J. (2011). Functional thinking as a route into algebra in the elementary grades. In J. Cai & E. Knuth (Eds.), Early algebraization: A global dialogue from multiple perspectives (pp. 5–23). Springer-Verlag.
5. Brown, T. A. (2015). Confirmatory factor analysis for applied research. Guilford Press.