Asturi, Nur Anjar, Hairida, and Erlina. “Environmental Chemistry in Context: A Digital Supplement on Coconut Shell Briquettes”. Hydrogen: Jurnal Kependidikan Kimia 13, no. 4 (August 31, 2025): 835–851. Accessed October 12, 2025. https://e-journal.undikma.ac.id/index.php/hydrogen/article/view/16723.