Mujica- Stach, A. M., and M. Márquez Torres. “Mathematical Thinking in Early Childhood: Teaching Strategies of Preschool Educators”. Mendive. Journal on Education, vol. 20, no. 4, Oct. 2022, pp. 1338-52, https://mendive.upr.edu.cu/index.php/MendiveUPR/article/view/3066.