KHAMIS MOHAMMED, B. The Effect of Using Flexible Groups Stratategy on the Achienement of Fifth Primary Class Pupils in Information and Its Retention. College of Basic Education Research Journal, [S. l.], v. 13, n. 1, p. 1–26, 2014. Disponível em: https://stats.uomosul.edu.iq/index.php/berj/article/view/39533. Acesso em: 26 oct. 2025.