“HEAVY METALS POLLUTION INDICES IN TANNERY SLUDGE FERTILIZED FARMS AROUND HAUSAWAN KABA, KANO, NIGERIA”. FUDMA JOURNAL OF SCIENCES, vol. 3, no. 4, Apr. 2023, pp. 61-66, https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1621.