Muliani, M., and I. Irmayanti. “Relationship Between the Urinary Bladder Capacity With the Incidence of Urinary Retention in Postpartum Physiological Mother”. American Scientific Research Journal for Engineering, Technology, and Sciences, vol. 18, no. 1, Apr. 2016, pp. 297-03, https://asrjetsjournal.org/index.php/American_Scientific_Journal/article/view/1576.