Nasution, A., R. Ramayati, S. Sofyani, O. Ramayani, and R. Siregar. “Quality of Sleep and Hypertension in Adolescents”. Paediatrica Indonesiana, Vol. 56, no. 5, Jan. 2017, pp. 272-6, doi:10.14238/pi56.5.2016.272-6.