SIANIPAR, R. S. .; SIJABAT, D. .; SIMANJUNTAK, B. . The Effect of Problem-Based Learning (PBL) on the Critical Thinking Skills of Fourth Grade Students. Jurnal Ilmu Sosial dan Humaniora , [S. l.], v. 4, n. 1, p. 359–368, 2026. DOI: 10.58540/isihumor.v4i1.1495. Disponível em: https://putrapublisher.org/ojs/index.php/isihumor/article/view/1495. Acesso em: 18 apr. 2026.