WASET
    Kollie B. Dogba and  Willis Oluoch-Kosura and  Chepchumba Chumo,  Economic Efficiency of Cassava Production in Nimba County, Liberia: An Output-Oriented Approach.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2020, vol. 168(12). 168 - 174
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10011654.