Ms.Dipali Rana. “Effect of Verbal Encouragement and Visual Biofeedback on Peak Expiratory Flow Rate in Healthy Young Subjects”. International Journal of Allied Medical Sciences and Clinical Research 4, no. 3 (August 6, 2020): 517–521. Accessed May 8, 2024. https://ijamscr.com/ijamscr/article/view/299.