Rejeki, Sri, Ariawan Soejonoes, Soenarjo Soenarjo, and Amin Husni. 2017. “Pain Level and Prostaglandin-E2 Using Counter-Pressure During 1st Stage of Labor”. Jurnal Ners 9 (1):111-17. https://doi.org/10.20473/jn.v9i1.3256.