Mahmoud, H.E., EL-Din, S.B., Sadek, M. and kader, L.A.-E. 2017. Efficacy of Breathing Exercises on daily living activities of patients with Chronic Obstructive Pulmonary Disease. International journal of Nursing Didactics. 7, 6 (Jun. 2017), 44–53. DOI:https://doi.org/10.15520/ijnd.2017.vol7.iss6.225.