Saroyo, Yudianto B, and Mahendri D Danarti. “Prediction of Vaginal Delivery Using Fetal Head Descent Assessed Using Transperineal Ultrasound: Penilaian Penurunan Kepala Dengan USG Transperineal Untuk Penentuan Keberhasilan Persalinan Pervaginam”. Indonesian Journal of Obstetrics and Gynecology 5, no. 3 (November 1, 2017): 149–153. Accessed April 2, 2026. https://www.inajog.com/index.php/journal/article/view/541.