"MANUFACTURING SOAP FROM WASTE COOKING OIL USING COLD AND HOT PROCESSES" (2020) FULafia Journal of Science and Technology, 6(2), ص 32–36. موجود في: https://lafiascijournals.org.ng/index.php/fjst/article/view/179 (تاريخ الوصول: 17 مايو 2026).