Rizkita, Dea, Suparman, and Desti Haryani. “Cognitive Level Analysis of Class VII Middle School Mathematics Textbooks”. Jurnal Pendidikan 24, no. 2 (February 28, 2024): 157–173. Accessed May 13, 2024. https://e-journal.upr.ac.id/index.php/JPN/article/view/10752.