Fitria, R. and Wahyuny, R. 2021. THE EFFECTIVENESS OF GIVING BIRTH BALL METHOD TO THE INTENSITY OF STAGE I LABOR PAIN IN THE ACTIVE PHASE IN BPM ROKAN HULU: EFEKTIVITAS PEMBERIAN METODE BIRTH BALL TERHADAP INTENSITAS NYERI PERSALINAN KALA I FASE AKTIF DI BPM ROKAN HULU. Jurnal Martenity and Neonatal. 3, 3 (Feb. 2021), 210–220.