Sahara, Rica, Febry Mutiariami Dahlan, and Cholisah Suralaga. “The Effect Of The Use Of Birth Ball On Intensity Of Labor Pain I Active Phase In Primigravidal Mothers In Pmb Bekasi City In 2022”. Science Midwifery 10, no. 3 (August 9, 2022): 2095–2101. Accessed May 2, 2026. https://midwifery.iocspublisher.org/index.php/midwifery/article/view/615.