Safriana, Latifah, Harsono Salimo, and Yulia Lanti Retno Dewi. 2017. “Biopsychosocial Factors, Life Course Perspective, and Their Influences on Language Development in Children”. Journal of Maternal and Child Health 2 (3):245-56. http://thejmch.com/index.php/thejmch/article/view/61.