Alam, A., and S. M. A. Zakaria. “Oral Nifedipine Versus Intravenous Labetalol for Acute Blood Pressure Control in Hypertensive Emergencies of Pregnancy: A Randomized Controlled Trial”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 8, no. 5, Apr. 2019, pp. 1921-7, doi:10.18203/2320-1770.ijrcog20191943.