Singh , S. ., S. K. . Verma, S. . Kumar, Suryakant, S. K. . Singh, and R. K. . Gupta. “CYTOKINES IN CHRONIC OBSTRUCTIVE PULMONARY DISEASE”. International Journal of Research and Development in Pharmacy & Life Sciences, vol. 4, no. 4, July 2015, pp. 1611-9, https://ijrdpl.com/index.php/ijrdpl/article/view/447.