Bukar, AM, MA Isa, HS Bello, and AS Abdullahi. “Antibacterial Activityof Aqueous And Ethanolic Leaf Extracts Of Vernonia Amygdalina On Selected Species Of Gram Positive And Gram Negative Bacteria”. International Journal of Environment 2, no. 1 (December 2, 2013): 147–152. Accessed June 10, 2023. https://www.nepjol.info/index.php/IJE/article/view/9217.