ESTHER CHRISTINE ROMATUA; SILVIA MONA. EFFECTIVENESS OF DEEP BACK MASSAGE IN REDUCING FIRST-STAGE LABOR PAIN AMONG WOMEN IN ACTIVE LABOR: A PRE-EXPERIMENTAL STUDY. Zona Kebidanan: Program Studi Kebidanan Universitas Batam, [S. l.], v. 16, n. 3, 2026. DOI: 10.37776/zkeb.v16i3.2347. Disponível em: https://ejurnal.univbatam.ac.id/index.php/zonabidan/article/view/2347. Acesso em: 5 oct. 2026.