K. L. Madhona, J. Jasmawati, and S. Raihanah, “PENGARUH BIRTHBALL TERHADAP INTENSITAS NYERI KALA I PERSALINAN: THE INFLUENCE OF BIRTHBALL ON THE INTENSITY OF PAIN IN DELIVERY”, bunda edu-midwifery j., vol. 6, no. 2, pp. 83–88, Sep. 2023.