Nurfadhila, Shafira, and Erliza Hambali. “Liquid Smoke from Coconut Shell Pyrolysis Process on Palm Surfactant Based Liquid Hand Soap”. International Journal of Oil Palm 5, no. 2 (July 1, 2022): 50–57. Accessed April 20, 2024. http://ijop.id/index.php/ijop/article/view/71.