Aziz Kareem, Rafah, and 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 (August 3, 2019): 1337-1365. Accessed July 14, 2025. https://mail.produccioncientificaluz.org/index.php/opcion/article/view/27384.