Nasution, J. D., I. Indrawati, and A. Batubara. “The Overview of Pregnant Women Knowledge on Preeclampsia Disease in Midwifery Polyclinic Adam Malik Hospital 2016”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 37, no. 3, Mar. 2018, pp. 150-62, https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/8475.