Younus, S. ., A. Najam, B. . Sultana, M. . Hussain, A. . Mudassir, and S. . Rafiq. “Study of Factors Contributing to the Increasing Incidence of Pneumonia During Pregnancy”. Pakistan Journal of Chest Medicine, vol. 28, no. 1, Mar. 2022, pp. 26-30, https://pjcm.net/index.php/pjcm/article/view/852.