Essien , G. E., P. S. Thomas, and . I. M. Udoette. “In Vitro Antioxidant Analysis and Quantitative Determination of Phenolic and Flavonoid Contents of Emilia Sonchifolia (L) D.C (Asteraceae) Leaf Extract and Fractions”. GSC Biological and Pharmaceutical Sciences, vol. 11, no. 2, May 2020, pp. 044-52, doi:10.30574/gscbps.2020.11.2.0123.