Díaz Martínez, María Victoria, and Nancy Amor Pérez. “Characterization of Socio Affective Development of the Child in the First Year of Life”. Mendive. Journal on Education 5, no. 4 (September 23, 2007): 260–264. Accessed July 22, 2024. https://mendive.upr.edu.cu/index.php/MendiveUPR/article/view/259.