HASHEM HASHEM, M. The effect of the PQ4R strategy on the mathematical average in mathematics logic of intelligence for second graders. College of Basic Education Research Journal, [S. l.], v. 16, n. 3, p. 50–76, 2020. DOI: 10.33899/berj.2020.165983. Disponível em: https://stats.uomosul.edu.iq/index.php/berj/article/view/39387. Acesso em: 26 oct. 2025.