FADEL HAMMADI, O. The effect of numbered heads strategy on the achievement of intermediate second-grade students in mathematics and their attitudes toward it. College of Basic Education Research Journal, [S. l.], v. 19, n. 1, p. 340–368, 2023. DOI: 10.33899/berj.2023.178048. Disponível em: https://moss.uomosul.edu.iq/index.php/berj/article/view/39642. Acesso em: 26 oct. 2025.