Fernández Escalona, C. M. and Domínguez Fernández, N. (2015) “Sums and substracts in Early Childhood Education”, Tendencias Pedagógicas, 26, pp. 319–330. Available at: https://revistas-new.uam.es/tendenciaspedagogicas/article/view/2140 (Accessed: 27 October 2025).