Kawedo, Elvis, et al. “Effect of Spent Engine Oil Pollution and Liquid Organic Fertilizer Application on Soil Chemical Properties and Nutrient Contents of Maize (Zea Mays)”. Sustinere: Journal of Environment and Sustainability, vol. 8, no. 1, May 2024, pp. 16-28, doi:10.22515/sustinere.jes.v8i1.358.