Sumantrie, Pipin, and Martalina Limbong. “Effect of Autogenic Relaxation on Blood Pressure Reduction in Elderly Patients With Hypertension”. Science Midwifery, vol. 9, no. 1, Oktober, Oct. 2020, pp. 10-14, https://midwifery.iocspublisher.org/index.php/midwifery/article/view/27.