Pratiwi L. PENGARUH PIJAT ENDORPHIN TERHADAP INTENSITAS NYERI PUNGGUNG PADA IBU BERSALIN PRIMIGRAVIDA KALA I FASE AKTIF DI PMB R KOTA B TAHUN 2023: THE EFFECT OF ENDORPHIN MASSAGE ON THE INTENSITY OF BACK PAIN IN PRIMIGRAVIDA WOMEN IN THE 1ST ACTIVE PHASE IN PMB R CITY B, 2023. bunda edu-midwifery j. [Internet]. 2024 Feb. 29 [cited 2024 Nov. 15];7(1):258-64. Available from: https://bemj.e-journal.id/BEMJ/article/view/186