WASET
    S. A. Nta,  Ecological Risk Assessment of Heavy Metals in Contaminated Soil from a Point Source.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2021, vol. 171(3). 119 - 122
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10011907.