Nnamani, R. C. ., P. N. . Okwu, B. . John, and O. J. . Abayeh. “Preliminary Investigation of Transesterified Waste Cooking Oil (WCO) As a Biodiesel ”. Journal of Chemical Society of Nigeria, vol. 45, no. 5, Aug. 2020, doi:10.46602/jcsn.v45i5.515.