Nigam, P., P. K. Baghel P.K., M. Jain, and P. Kushawha. “Cardiopulmonary Changes in Rheumatoid Arthritis”. International Journal of Medical Research and Review, Vol. 2, no. 3, June 2014, pp. 228-33, doi:10.17511/ijmrr.2014.i03.06.