BichiA. A., ButuA. W., and GadanyaM. A. “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.