Kaur, D. H., Thaman, D. R. G., Dhillon, D. S. K., & Kaur, S. (2011). Relationship between Smoking and Pulmonary Functions: Relationship Between Smoking And Pulmonary Functions. National Journal of Integrated Research in Medicine, 2(4), 1–6. Retrieved from http://nicpd.ac.in/ojs-/index.php/njirm/article/view/1929