HERLINA. UPAYA PENINGKATAN HASIL DAN MOTIVASI BELAJAR IPS MELALUI MODEL PEMBELAJARAN PROBLEM BASED LEARNING (PBL). Jurnal Ilmu Pendidikan dan Sosial, [S. l.], v. 1, n. 4, p. 460–464, 2022. DOI: 10.58540/jipsi.v1i4.95. Disponível em: http://www.putrapublisher.org/ojs/index.php/jipsi/article/view/95. Acesso em: 13 oct. 2025.