Yusuff, A.S., O.D. Adeniyi, M.A. Olutoye, and U.G. Akpan. 2017. “A Review on Application of Heterogeneous Catalyst in the Production of Biodiesel from Vegetable Oils”. Journal of Applied Science &Amp; Process Engineering 4 (2):142-57. https://doi.org/10.33736/jaspe.432.2017.