H. Simanjuntak, H. N. F. . Rohmah, and I. K. F. . Wardani, “The Effectiveness of Acupressure Versus Birth Ball on Reducing Labor Pain and Shortening the First Stage of Labor: A Comparative Study”, J. Health Nutr. Res, vol. 5, no. 2, pp. 941–948, Aug. 2026.