Morika, Honesty Diana, Indah Komala Sari, Rhona Sandra, and Eliza Arman. “The Effect of Pursed Lip Breathing Exercise Against Decrease of Breathing Levels in Chronic Obstruction Pulmonary Disease”. International Journal Of Community Medicine And Public Health 6, no. 11 (October 24, 2019): 4695–4698. Accessed October 28, 2025. https://www.ijcmph.com/index.php/ijcmph/article/view/5332.