Esparó, Griselda, Margarita Torrente, Joan D. Fernández-ballart, and Josepa Canals. “Psychological Problems and Associated Factors at 6 Years of Age: Differences Between Sexes”. The Spanish Journal of Psychology 7, no. 1 (April 6, 2004): 53–62. Accessed November 15, 2024. https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0404120053A.