Umeoguaju, Francis U., et al. “Macroporous Resin-Assisted Enrichment of Total Flavonoids, Polyphenols and Antioxidants from Newbouldia Laevis Leaf Extracts: Http: www.doi.org 10.26538 Tjnpr V7i1.28”. Tropical Journal of Natural Product Research (TJNPR), vol. 7, no. 1, Feb. 2023, pp. 2270-8, https://tjnpr.org/index.php/home/article/view/1517.