Ilgaz, Gokhan, Levent Vural, and Menekse Eskici. β€œIs the Source for My Curriculum Knowledge and Other Competencies the Same? Evidence from PISA 2015”. Cypriot Journal of Educational Sciences 14, no. 4 (December 31, 2019): 706–722. Accessed April 25, 2024. https://un-pub.eu/ojs/index.php/cjes/article/view/4122.