Ali Khan, N. ., A. ur Rehman, I. Khan, K. A. Samo, and A. S. Memon. “Role of Incentive Spirometry in Trauma Patients Managed With Tube Thoracostomy”. Journal of the Dow University of Health Sciences (JDUHS), vol. 9, no. 3, Dec. 2015, pp. 117-20, https://jduhs.com/index.php/jduhs/article/view/1437.