يوسف حسن الحربي ل. The effect of using learning circle on the achievement of second intermediate pupils in Islamic education subject. College of Basic Education Research Journal, [S. l.], v. 10, n. 2, p. 23–57, 2011. Disponível em: https://stats.uomosul.edu.iq/index.php/berj/article/view/38391. Acesso em: 26 oct. 2025.