“Age, Parity, Physical Activity, Birth Weight, and the Risk of Perineum Rupture at PKU Hospital in Delanggu, Klaten, Central Java”. Journal of Maternal and Child Health 1, no. 2 (April 16, 2016): 93–100. Accessed November 17, 2025. https://thejmch.com/index.php/thejmch/article/view/17.