Desty Yuanda, Dwi Endarti, and Diah Ayu Puspandari. “Direct Hospitalization Cost of Chronic Obstructive Pulmonary Disease (COPD): A Systematic Review”. Jurnal Multidisiplin Sahombu 6, no. 01 (January 6, 2026): 50–59. Accessed July 4, 2026. https://ejournal.seaninstitute.or.id/index.php/JMS/article/view/7939.