“HEAVY METALS POLLUTION INDICES IN TANNERY SLUDGE FERTILIZED FARMS AROUND HAUSAWAN KABA, KANO, NIGERIA”. FUDMA JOURNAL OF SCIENCES 3, no. 4 (April 11, 2023): 61–66. Accessed September 17, 2025. http://162.254.38.185/index.php/fjs/article/view/1621.