Aziz Kareem, Rafah, y Zuhra Mezaal Mezban. «The Effect of Karen’s Model in The Achievement and The Development of Levels of Understanding Mathematics for Female Students Intermediate». Opción 350 (agosto 3, 2019): 1337-1365. Accedido enero 18, 2026. http://mail.produccioncientificaluz.org/index.php/opcion/article/view/27384.