“HUBUNGAN WATER BIRTH DAN PERSALINAN KONVENSIONAL DENGAN LAMA KALA II PRIMIGRAVIDA DI RS PMC PEKANBARU”. JPK : Jurnal Proteksi Kesehatan 5, no. 1 (October 23, 2018). Accessed January 18, 2026. https://jurnal.pkr.ac.id/JPK/article/view/48.