U. Igwe, Chidi, et al. “Phenolic Profile and In Vitro Antioxidant Potential of Four Medicinal Plants: doi.org 10.26538 Tjnpr V5i11.24”. Tropical Journal of Natural Product Research (TJNPR), vol. 5, no. 11, Nov. 2021, pp. 2037-42, https://tjnpr.org/index.php/home/article/view/358.