Rizka, Aulia, Siti Setiati, Aida Lydia, and Esthika Dewiasty. 2018. “Effect of Nigella Sativa Seed Extract for Hypertension in Elderly: A Double-Blind, Randomized Controlled Trial”. Acta Medica Indonesiana 49 (4):307. http://actamedindones.org/index.php/ijim/article/view/387.