Elbadawi, AA, SA Suliman, HM Elkhair, HH Abuelhassan, and MK Sabahelkhier. 2014. “Recycling Edible Vegetable Oils by Using Various Types of Alkali With Alcohol to Produce Biodiesel and Study Its Optical and Physical Properties”. International Journal of Environment 3 (2):143-49. https://doi.org/10.3126/ije.v3i2.10525.