TURNIP, Marthin; SIHOMBING, Lisbet N.; PASARIBU, Eva. Hubungan Model Problem Based Learning dengan Keaktifan Siswa Kelas IV SD Negeri 091281 Kabupaten Simalungun . Jurnal Pendidikan dan Konseling (JPDK), [S. l.], v. 4, n. 6, p. 6399–6406, 2022. DOI: 10.31004/jpdk.v4i6.9309. Disponível em: https://journal.universitaspahlawan.ac.id/index.php/jpdk/article/view/9309. Acesso em: 5 dec. 2025.