Ekere, N.R., T.I. Oparanozie, J.N. Ihedioha, and V.E. Agbazue. “Distribution and Health Risks of Nitrate and Heavy Metals in Edible Leafy Vegetables Grown in Sewage Sludge and Wastewater-Amended Agricultural Soils”. Asian Journal of Chemistry 28, no. 1 (October 5, 2015): 6–10. Accessed July 3, 2024. https://asianpubs.org/index.php/ajchem/article/view/28_1_2.