Tahir Aslam, Amer Bilal, Abdul Baseer, Abid Khan, Manzoor Ahmed, and A. A. Salam. “Critical Conditions Leading to Empyema Thoracis Among Patients in Thoracic Surgery Ward, Lady Reading Hospital Peshawar”. Pakistan Journal of Medical Research, vol. 59, no. 3, Nov. 2020, pp. 111-4, https://pjmr.org.pk/index.php/pjmr/article/view/34.