Ranggoli, Putri Wulandari, Novianita Achmad, and Putri Ekawaty Kobandaha. 2025. “Mathematical Concept Understanding of Middle School Students: An Experimental Study of the Discovery Learning Model”. ETDC: Indonesian Journal of Research and Educational Review 4 (3):834-44. https://doi.org/10.51574/ijrer.v4i3.3305.