Ugariogu, S.N. et al. 2020. 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). 4, 12 (Dec. 2020), 1208–1214.