Bichi, A. A., A. W. Butu, and M. A. Gadanya. “AN ANALYSIS OF SAFETY LEVEL OF METAL CONTAMINANTS IN RIVER HADEJIA CATCHMENT, KANO REGION, NIGERIA”. FUDMA JOURNAL OF SCIENCES, Vol. 2, no. 2, Mar. 2023, pp. 176 -83, https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1364.