Bulgarelli, Daniela, and Paola Molina. “Early Childcare, Maternal Education and Family Origins: Differences in Cognitive and Linguistic Outcomes Throughout Childhood”. Revista de Cercetare Si Interventie Sociala, vol. 52, Mar. 2016, pp. 5-25, https://www.rcis.ro/journal/article/view/2252-early-childcare-maternal-education-and-family-origins.