the effect of using Polya strategy on the achievement of secondary school grade in chemistry . Journal of the College of Basic Education, [S. l.], v. 26, n. 106, p. 371–392, 2020. DOI: 10.35950/cbej.v26i106.4873. Disponível em: https://cbej.uomustansiriyah.edu.iq/index.php/cbej/article/view/4873.. Acesso em: 23 jul. 2024.