«In Vitro Antioxidant Properties of Methanolic Leaf Extract of Vernonia Amygdalina Del» (2021) Nigerian Journal of Physiological Sciences, 29(2), or. 091–101. Available at: https://www.ojshostng.com/index.php/njphysiologicalsciences/article/view/1812 (Eskuratua: 6 apirila 2026).