Ugariogu, Sylvester N., et al. “Physicochemical Assessment and Drug Potential of Some Phenylpropanoid and Flavonoid Compounds of Ethyl Acetate Eluate from Umudike Propolis: doi.org 10.26538 Tjnpr V4i12.30”. Tropical Journal of Natural Product Research (TJNPR), vol. 4, no. 12, Dec. 2020, pp. 1208-14, https://tjnpr.org/index.php/home/article/view/911.