Galadima, A. ., A. . Lawal, R. Muhammad, and M. Abubakar. “Local Rock Sample As Catalytic Material for Biodiesel Production via Transesterification of Used Cooking Oil”. International Journal of Science for Global Sustainability, vol. 9, no. 1, Mar. 2023, p. 7, doi:10.57233/ijsgs.v9i1.392.