Gultom, Erdiana, Hestina Hestina, Nova Florentina, and Barita Aritonang. “Paper Making and Characterization from Waste Coconut and Tofu Dregs”. Jurnal Pendidikan Kimia 13, no. 2 (August 1, 2021): 159–171. Accessed June 4, 2025. https://jurnal.unimed.ac.id/2012/index.php/jpk/article/view/27028.