Muhammad Shehroz Khan, Shereen Khan, Musarat Javed, Mujeeb Ullah Khan Doutani, Syed Abdul Waheed, and Gul habib. “Frequency of Positive Sputum Cultures and the Microorganisms Frequently Complicating Exacerbations of COPD”. Journal of Health, Wellness and Community Research (June 10, 2025): e498. Accessed August 24, 2025. https://jhwcr.com/index.php/jhwcr/article/view/498.