1. Battista, M. T. (2008). Development of the Shape Makers geometry microworld: Design principles and research. In G. Blume & K. Heid (Eds.), Research on technology in the learning and teaching of mathematics: Cases and perspectives (Vol. 2, pp. 131–156). Charlotte, NC: NCTM/Information Age Publishing.
2. Becker, J. P., & Jacob, B. (2000). The politics of California school mathematics: The anti-reform of the 1997–1999. Phi Delta Kappan, 81, 529–537.
3. Clements, D. H. (1997). (Mis?)Constructing constructivism. Teaching Children Mathematics, 4(4), 198–200.
4. Clements, D. H., Fuson, K. C., & Sarama, J. (2017). The research-based balance in early childhood mathematics: A response to Common Core criticisms. Early Childhood Research Quarterly, 40, 150–162.
5. Clements, D. H., & Sarama, J. (2004). Hypothetical learning trajectories. Mathematical Thinking and Learning, 6(2), 81–89.