"MANUFACTURING SOAP FROM WASTE COOKING OIL USING COLD AND HOT PROCESSES". FULafia Journal of Science and Technology 6, no. 2 (سبتمبر 30, 2020): 32–36. تاريخ الوصول مايو 17, 2026. https://lafiascijournals.org.ng/index.php/fjst/article/view/179.