Differences in Mathematics and Science Achievement by Grade 5 and Grade 8 Student Economic Status: A Multiyear, Statewide Study. Global Journal of Human-Social Science, [S. l.], v. 17, n. H5, p. 15–26, 2017. Disponível em: https://socialscienceresearch.org/index.php/GJHSS/article/view/2332. Acesso em: 6 aug. 2026.