Esparó, Griselda, Margarita Torrente, Joan D. Fernández-ballart, y Josepa Canals. «Psychological problems and associated factors at 6 years of age: Differences between sexes». The Spanish Journal of Psychology 7, no. 1 (abril 6, 2004): 53–62. Accedido julio 22, 2026. https://revistas.ucm.es/index.php/SJOP/article/view/SJOP0404120053A.