RENI TANIA; WELVEN AIDA. PENGARUH MODEL PEMBELAJARAN PROBLEM BASED LEARNING TERHADAP KEMAMPUAN BERPIKIR KRITIS SISWA KELAS IX MATA PELAJARAN IPS DI SMP NEGERI 1 BANGUN PURBA. Bakoba : Journal of Social Science Education, [S. l.], v. 1, n. 1, p. 24–33, 2021. Disponível em: https://journal.upp.ac.id/index.php/bakoba/article/view/587. Acesso em: 6 jul. 2022.