El-Gerby, Sarah, and Sherine Al-Shawarby. “Hierarchical Linear Modeling of Grade 8 Math Achievement in TIMSS: Explaining Learning Gaps in Egypt”. Journal of Cultural Analysis and Social Change 11, no. 1 (January 1, 2026): 500–512. Accessed October 12, 2026. https://jcasc.com/index.php/jcasc/article/view/3893.