Jose, Ajo K., Davis P. Chelangara, and Shaji K. S. “Factors Associated With Anxiety and Depression in Chronic Obstructive Pulmonary Disease”. International Journal of Research in Medical Sciences 4, no. 4 (December 28, 2016): 1074–1079. Accessed May 17, 2025. https://www.msjonline.org/index.php/ijrms/article/view/652.