Amos Barus. Peningkatan Hasil Belajar Ilmu Pengetahuan Sosial Melalui Problem Based Learning Siswa Kelas VIII SMP N 1 Gunung Meriah Kab. Dewi Serdang Sumatera Utara. JP3 [Internet]. 2022Feb.13 [cited 2025Aug.16];4(2):422-31. Available from: https://www.ejournal-jp3.com/index.php/Pendidikan/article/view/459