”The Aqueous Calyx Extract of Hibiscus sabdariffa Lowers Blood Pressure and Heart Rate via Sympathetic Nervous System Dependent Mechanisms” (2021) Nigerian Journal of Physiological Sciences, 29(2), s. 131–136. Tillgänglig vid: https://ojshostng.com/index.php/njphysiologicalsciences/article/view/1820 (åtkomstdatum: 16 maj 2026).