Mohamed M. A. Abdalla and  M. F Mohamed and  A. M. A. Rashwan,  Yield Performance of Two Locally Adapted and Two Introductions of Common Cowpea in Response to Amended In-Row-Spaces and Planting Dates.   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    October 2015, vol. 102(6). 699 - 704
    [viewed 16 April 2024]. Available from: https://publications.waset.org/pdf/10002989.