SIAHAAN, Yos Rizal Fernandes; NAPITUPULU, Martina Asiati; SIMARMATA, Juliana. Pengaruh Problem-Based Learning terhadap Keterampilan Berpikir Kritis dan Hasil Belajar Materi Ekosistem Sekolah Menengah Atas. Journal of Education Research, [S. l.], v. 7, n. 4, p. 2904–2911, 2026. DOI: 10.37985/jer.v7i4.3859. Disponível em: https://jer.or.id/index.php/jer/article/view/3859. Acesso em: 11 sep. 2026.