“The Aqueous Calyx Extract of Hibiscus sabdariffa Lowers Blood Pressure and Heart Rate via Sympathetic Nervous System Dependent Mechanisms”, NJPS, vol. 29, no. 2, hlm. 131–136, Mei 2021, Diakses: 11 Juni 2026. [Daring]. Tersedia pada: https://ojshostng.com/index.php/njphysiologicalsciences/article/view/1820