Garba, N.A., Shehu, S., and Mathew, D. C. “Characterization of Watermelon (Citrullus Vulgaris) and Calabash (Lagenaria Vulgaris) Seeds Oil As Potential Feedstock for Biodiesel Production”. International Journal of Science for Global Sustainability, vol. 6, no. 3, Oct. 2020, p. 6, https://fugus-ijsgs.com.ng/index.php/ijsgs/article/view/94.