Okoro, L. C., M. O. Nwachukwu, and S. G. I. Ikeh. “Assessment of Heavy Metal Contents in Three Different Land Used Soils in Ohaji/Egbema Imo State, Nigeria”. Asian Soil Research Journal, Vol. 5, no. 1, Mar. 2021, pp. 38-47, doi:10.9734/asrj/2021/v5i130100.