Farooq, M., J. Anjum, M. I. U. . Haq, M. A. . Masood, M. . Imran, and M. . Shuaib. “Evaluating Health-Related Quality of Life in Patients With Chronic Obstructive Pulmonary Disease”. Pakistan Journal of Chest Medicine, vol. 28, no. 3, Sept. 2022, pp. 378-85, https://pjcm.net/index.php/pjcm/article/view/864.