MENINGKATKAN MOTIVASI BELAJAR PESERTA DIDIK DALAM MATA PELAJARAN EKONOMI MELALUI MODEL PROBLEM BASED LEARNING PBL PADA KELAS XI SMAN 1 BOLANGITANG TIMUR. jpe-unima [Internet]. 2025 Oct. 23 [cited 2026 Mar. 24];4(1s):169 175. Available from: https://ejurnal.unima.ac.id/index.php/jpe-unima/article/view/8167