Esther Christine Romatua, and 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 16, no. 3 (September 30, 2026). Accessed October 5, 2026. https://ejurnal.univbatam.ac.id/index.php/zonabidan/article/view/2347.