Sriyanti, R., J. C. Mose, M. Masrul, and N. Suharti. “The Difference in Maternal Serum Hypoxia-Inducible Factors-1α Levels Between Early Onset and Late-Onset Preeclampsia”. Open Access Macedonian Journal of Medical Sciences, vol. 7, no. 13, Aug. 2019, pp. 2133-7, doi:10.3889/oamjms.2019.601.