Parasuraman, Sugunesvaran, Tan Chung Keat, and Nurhayati Binti Mohd Marzuki. “HEALTH-RELATED QUALITY OF LIFE AND SLEEP QUALITY AMONG COPD PATENTS IN MALAYSIA”. Malaysian Journal of Public Health Medicine 21, no. 1 (April 24, 2021): 112–120. Accessed December 3, 2023. http://mjphm.org/index.php/mjphm/article/view/640.