A. Bethencourt-Aguilar, M. I. . Fernández Esteban, C. J. González Ruiz, and S. Martín-Gómez, “Open Educational Resources (OER) in Early Childhood Education: technological, didactic and socio-communicative characteristics”, IJTEI, vol. 7, no. 2, pp. 32–45, Dec. 2021.