E. LUBIS and W. Sugiarti, “HUBUNGAN UMUR DAN PARITAS DENGAN KEJADIAN PARTUS LAMA DI RSB PERMATA HATI METRO TAHUN 2019: RELATIONSHIP OF AGE AND PARITY WITH THE EVENT OF OLD PARTUS AT PERMATA HATI METRO Hospital in 2019”, bunda edu-midwifery j., vol. 4, no. 1, pp. 23–30, Feb. 2021.