Imaniar, Melsa Sagita, et al. “Effect of Upright Position on Pain and Duration of the Active Phase of the First Stage of Labor Among Women in Labor in the Work Area of Tasikmalaya TPMB”. EMBRIO: Jurnal Kebidanan, vol. 15, no. 1, May 2023, pp. 21-27, https://doi.org/10.36456/embrio.v15i1.6758.