Tresia Fransiska Ulianna Tambunan, Moerdjajati Angka, Anita Ratnawati and Zulkifi Amin 2013. Effects of Inspiratory Muscle Training with Incentive Spirometry to Maximum Inspiratory Capacity and Quality of Life on Chronic Obstructive Pulmonary Disease Patients. Indonesian Journal of Physical Medicine and Rehabilitation. 2, 01 (Jun. 2013), 55 - 63. DOI:https://doi.org/10.36803/ijpmr.v2i01.227.