LESTARI, Risma; SUKMAWARDANI, Yulia; SUBARKAH, Cucu Zaenab; FARIDA, Ida. Application of Problem-Based Worksheets to Develop Higher Order Thinking Skills In The Utilization of Coconut Shells As Zn Metal Adsorbent In Laboratory Waste. Hydrogen: Jurnal Kependidikan Kimia, [S. l.], v. 12, n. 4, p. 879–892, 2024. DOI: 10.33394/hjkk.v12i4.12191. Disponível em: https://e-journal3.undikma.ac.id/index.php/hydrogen/article/view/12191. Acesso em: 16 aug. 2025.