Sirag, Nizar, 		MM, Elhadi, 		Algaili, Algaili M, AND 		Ohaj, Mohamed.
" Determination of Total Phenolic Content and Antioxidant Activity of Roselle (Hibiscus sabdariffa L.) Calyx and Epicalyx Ethanolic (Alcoholic) Extract" <em>Gezira Journal of Health Sciences</em> [Online], Volume 10 Number 1 (1 June 2014)