Purba, Nadila, Natalina Purba, & Emelda Thesalonika. " PENGARUH MODEL PROBLEM BASED LEARNING (PBL) TERHADAP HASIL BELAJAR MATEMATIKA SISWA DI KELAS IV SD." Jurnal Darma Agung [Online], 32.1 (2024): 607-619. Web. 2 May. 2025