“A study of drug utilization in patients with chronic obstructive pulmonary disease (COPD) in Mahavir institute of medical sciences, vikarabad, Telangana state” (2019) International Journal of Research in Pharmacology & Pharmacotherapeutics, 8(4), pp. 423–426. doi:10.61096/ijrpp.v8.iss4.2019.423-426.