SITORUS, J. J. B.; SUWEKEN, G. .; ARDANA, I. M. . Pengaruh Model Pembelajaran Problem Based Learning Dengan Pendekatan Difrensiasi Terhadap Kemampuan Pemecahan Masalah Matematika Siswa SMP Kelas VII Pada Materi Perbandingan: The Influence of the Problem-Based Learning Model with a Differentiated Approach on the Mathematical Problem-Solving Ability of Seventh-Grade Junior High School Students in Proportions. Citizen : Jurnal Ilmiah Multidisiplin Indonesia, [S. l.], v. 6, n. 2, p. 602–611, 2026. DOI: 10.53866/jimi.v6i2.1442. Disponível em: https://www.journal.das-institute.com/index.php/citizen-journal/article/view/1442. Acesso em: 16 jul. 2026.