Effendi, Y., Safyudin, and A. M. Rahmadayanti. “Hubungan Kejadian Preeklampsia Dengan Kadar Serum Β-Human Chorionic Gonadotropin (Β-HCG) Pada Kehamilan Trimester III”. Biomedical Journal of Indonesia, vol. 3, no. 2, May 2017, pp. 67-77, https://bji-fk.ejournal.unsri.ac.id/index.php/bji/article/view/8.