S. Y. Shabrina, P. Manurung, S. W. Suciyati, and P. K. Karo, “Manufacture of Nanocellulose from Red Onion Peel Waste Using Acid Hydrolysis Method with Variation of H2SO4 Concentration”, J. Energy Mater. Instrum. Technol., vol. 6, no. 2, pp. 54–59, May 2025.