«In Vitro Antioxidant Properties of Methanolic Leaf Extract of Vernonia Amygdalina Del» (2021) Nigerian Journal of Physiological Sciences, 29(2), s. 091–101. Tilgjengelig på: https://ojshostng.com/index.php/njphysiologicalsciences/article/view/1814 (åpnet: 6 april 2026).