D.ANANDHI et al. 2017. Immediate effect of proprioceptive neuromuscular facilitation (PNF) of respiratory muscles on pulmonary function in collegiate students. International Journal of Pharma and Bio Sciences. 8, 4 (Dec. 2017), 508–512. DOI:https://doi.org/10.22376/ijpbs.2017.8.4.b508-512.