Ime R. Udotong and  Justina I. R. Udotong and  Ofonime U. M. John,  Delineation of Oil – Polluted Sites in Ibeno LGA, Nigeria, Using Geophysical Techniques.   journal   = {International Journal of Environmental and Ecological Engineering}, [online]. World Academy of Science, Engineering and Technology.
    May 2015, vol. 102(6). 639 - 645
    [viewed 03 April 2020]. Available from: https://publications.waset.org/pdf/10001438.