R. Yoganathan and  H. K. L. K. Gunasekera and  R. Hariharan,  Integrated Use of Animal Manure and Inorganic Fertilizer on Growth and Yield of Vegetable Cowpea (Vigna uniquiculata).   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    August 2013, vol. 80(8). 775 - 778
    [viewed 08 May 2024]. Available from: https://publications.waset.org/pdf/16109.