SASMITHA, H. M.; KUSUMANINGTYAS, P.; ERIKA, F.; SUMARIOTO, S. Improving problems solving skills through problem-based learning of oil palm empty fruit bunch waste in science learning for students at SMAN 1 Muara Badak. Educational Studies: Conference Series, [S. l.], v. 4, n. 2, p. 111–1116, 2024. DOI: 10.30872/escs.v4i2.4630. Disponível em: https://jurnal.fkip.unmul.ac.id/index.php/escs/article/view/4630. Acesso em: 5 dec. 2025.