PENGARUH MODEL PEMBELAJARAN PROBLEM BASED LEARNING TERHADAP HASIL BELAJAR MATEMATIKA PESERTA DIDIK KELAS IX. JOURNAL OF SCIENCE AND SOCIAL RESEARCH, [S. l.], v. 9, n. 5, p. 7549 – 7557, 2026. DOI: 10.54314/jssr.v9i5.7178. Disponível em: https://jurnal.goretanpena.com/index.php/JSSR/article/view/7178.. Acesso em: 7 oct. 2026.