Rashid, Md Haroon Ur, and Iftikhar Ahmed. “Pattern of Sputum Bacteriology in Acute Exacerbations of Chronic Obstructive Pulmonary Disease”. Journal of Enam Medical College 8, no. 2 (May 30, 2018): 80–84. Accessed May 3, 2024. https://www.banglajol.info/index.php/JEMC/article/view/36730.