Nongraded versus Graded Elementary Schools: An Analysis of Achievement and Social Skills. Alberta Journal of Educational Research, [S. l.], v. 46, n. 4, 2000. DOI: 10.55016/ojs/ajer.v46i4.54832. Disponível em: https://dev.journalhosting.ucalgary.ca/index.php/ajer/article/view/54832. Acesso em: 14 dec. 2025.