Wira Ekdeni Aifa, Fajar Sari Tanberika, Sumandar. Effect Of Counterpressure With Birth Ball On Reduction Of Labor Pain In First Stage . midwifery [Internet]. 2022 Aug. 24 [cited 2026 Jul. 14];10(3):2353-8. Available from: https://midwifery.iocspublisher.org/index.php/midwifery/article/view/652