H. Andolo, A. Rooroh, A. Sakul, and S. Oroh, “PENINGKATAN PRESTASI BELAJAR EKONOMI MELALUI MODEL PROBLEM BASED LEARNING ( PBL ) KELAS X SMA NEGERI 1 GEMEH”, jpe-unima, vol. 4, no. 2s, pp. 158–167, Oct. 2025.