SIRAG, Nizar et al.
 Determination of Total Phenolic Content and Antioxidant Activity of Roselle (Hibiscus sabdariffa L.) Calyx and Epicalyx Ethanolic (Alcoholic) Extract.
<strong>Gezira Journal of Health Sciences</strong>, [S.l.], v. 10, n. 1, june 2014.
ISSN 1810-5386. Available at: &lt;<a href="http://37.60.236.48/index.php/gjhs/article/view/337" target="_new">http://37.60.236.48/index.php/gjhs/article/view/337</a>&gt;. Date accessed: 03 june 2026.