Oluwatoyin D. Kolawole and  Oarabile Mogobe and  Lapologang Magole,  Political Economy of Integrated Soil Fertility Management in the Okavango Delta, Botswana.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2013, vol. 83(11). 1073 - 1081
    [viewed 11 August 2020]. Available from: https://publications.waset.org/pdf/9996671.