Rizki, Lailatul Khusnul, and Yunik Windarti. “Differences In The Length Of Labor Stage II On Upright Position and Recumbent Position”. STRADA : Jurnal Ilmiah Kesehatan, vol. 10, no. 1, May 2021, pp. 120-4, doi:10.30994/sjik.v10i1.534.