“In Vitro Antioxidant Properties of Methanolic Leaf Extract of Vernonia Amygdalina Del” (2021) Nigerian Journal of Physiological Sciences, 29(2), s. 091–101. Tilgængelig hos: https://www.ojshostng.com/index.php/njphysiologicalsciences/article/view/1814 (Set: 8 juli 2026).