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Sitorus, J.J.B., Suweken, G. and Ardana, I.M. 2026. 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. 6, 2 (Jul. 2026), 602–611. DOI:https://doi.org/10.53866/jimi.v6i2.1442.