Terna T. Paul and  Agbara D. Onwoke,  Biological Control of Tomato Wilt Fungi Using Leaf Extracts of Bitter Leaf (Vernonia amygdalina).   journal   = {International Journal of Agricultural and Biosystems Engineering}, [online]. World Academy of Science, Engineering and Technology.
    November 2017, vol. 128(8). 644 - 647
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/10008291.