“THE RELATIONSHIP OF PREGNANCY EXERCISE TO PERINEAL RUPTURE AMONG PRIMIPAROUS WOMEN AT PMB DINCE SAFRINA OF PEKANBARU IN 2015 -2018”. JURNAL IBU DAN ANAK, vol. 8, no. 1, Juni 2020, hlm. 8-15, https://doi.org/10.36929/jia.v8i1.285.