WASET
    E. D. Paul and  H. Otanwa and  O. F. Paul and  A. J. Salifu and  J. E. Toryila and  C. E. Gimba,  Gradations in Concentration of Heavy and Mineral Elements with Distance and Depth of Soil in the Vicinity of Auto Mechanic Workshops in Sabon Gari, Kaduna State, Nigeria.   journal   = {International Journal of Chemical and Molecular Engineering}, [online]. World Academy of Science, Engineering and Technology.
    February 2015, vol. 99(3). 412 - 415
    [viewed 20 April 2024]. Available from: https://publications.waset.org/pdf/10000634.