Wang, Jianfang, Xuemei Lu, Chunhong Wang, and Xuemei Li. “The Effectiveness of Delivery Ball Use Versus Conventional Nursing Care During Delivery of Primiparae: Clinical Effect of Delivery Ball”. Pakistan Journal of Medical Sciences 36, no. 3 (March 4, 2020). Accessed April 23, 2024. https://pjms.org.pk/index.php/pjms/article/view/1440.