„In Vitro Antioxidant Properties of Methanolic Leaf Extract of Vernonia Amygdalina Del” (2021) Nigerian Journal of Physiological Sciences, 29(2), pp. 091–101. Disponibil la: http://ojshostng.com/index.php/njphysiologicalsciences/article/view/1812 (Data accesării: 2 iulie 2026).