Prakash, V. K. G., S. Gogineni, R. Kumar, and M. V. Shaik. “Six Minute Walk Test As a Monitoring Tool in Chronic Obstructive Pulmonary Disease on Pulmonary Rehabilitation”. Journal of Advances in Internal Medicine, vol. 2, no. 2, Sept. 2013, pp. 35-41, doi:10.3126/jaim.v2i2.8774.