Yalwa Rilwanu, Dr. Tasi'u, et al. “GEO-Accumulation Index for Heavy Metals in Groundwater: A Study of Bompai and Sharada Industrial Estates, Kano Metropolis, Nigeria”. Journal of Sustainable Natural Resources, vol. 3, no. 1, Oct. 2022, pp. 58-72, https://penerbit.uthm.edu.my/ojs/index.php/jsunr/article/view/11330.