Turnip, H., Ratnawati, A., Tulaar, A., Yunus, F. and Kekalih, A. (2014) “Comparison of the effects of treadmill and ergocycle exercise on the functional capacity and quality of life of patients with chronic obstructive pulmonary disease”, Medical Journal of Indonesia, 23(1), pp. 42–7. doi: 10.13181/mji.v23i1.726.