P. Shehu, B. Azi, S. Dyachia Zakka, A. Tanimu, N. Akanbi-Lawal, and A. Yakubu, “Effect of Mishandling and Vending of Used Engine Oil on the Environment, Health and Urban Planning in Kaduna Metropolis: A Call to Action for a Paradigm Shift”, upc, vol. 1, no. 1, pp. 9–25, Aug. 2024.