„In Vitro Antioxidant Properties of Methanolic Leaf Extract of Vernonia Amygdalina Del”. Nigerian Journal of Physiological Sciences 29, no. 2 (maj 20, 2021): 091–101. Dostęp maj 22, 2026. http://ojshostng.com/index.php/njphysiologicalsciences/article/view/1814.