KHAKPOUR, A. The effect of pre-school education on first-grade students’ social skill improvement. International Journal of Innovative Research in Education, [S. l.], v. 12, n. 1, p. 42–49, 2025. DOI: 10.18844/ijire.v12i1.9804. Disponível em: https://www.un-pub.eu/ojs/index.php/IJIRE/article/view/9804. Acesso em: 5 dec. 2025.