Sinha, Richa, Trisha Gupta, and Sonam Maheshwari. “A Cross Sectional Study to Assess the Levels of Depression and Anxiety in Patients With Chronic Obstruction Pulmonary Disease in a Tertiary Care Hospital”. Indian Journal of Community Health 33, no. 1 (March 31, 2021): 90–96. Accessed April 24, 2024. https://www.iapsmupuk.org/journal/index.php/IJCH/article/view/1975.