Landong, Ahmad, Dini Ayuningsih, and Inge Dita. “Development of Fourth Grade Math Teaching Materials Using the PBL Model on Student Learning Outcomes”. Cendikia : Media Jurnal Ilmiah Pendidikan 13, no. 6 (July 31, 2023): 943-953. Accessed August 22, 2026. https://iocscience.org/ejournal/index.php/Cendikia/article/view/3824.