Nurhidayah, Nurhidayah, and Rahayu Sri Waskitoningtyas. 2023. “Implementation of Problem-Based Learning Models to Improve Understanding of Mathematics Concepts at Al-Hassan High School”. Jurnal Math Educator Nusantara: Wahana Publikasi Karya Tulis Ilmiah Di Bidang Pendidikan Matematika 9 (1), 76-88. https://doi.org/10.29407/jmen.v9i1.19544.