Krongchon N ,Piboon K ,Oppawongsapat D. (2017). Effectiveness of Tai Chi Exercise Program on Self-Efficacy, Exercise Behavior and Pulmonary Function among COPD Patients. Journal of The Department of Medical Services, 42(4), 89–98. Retrieved from https://he02.tci-thaijo.org/index.php/JDMS/article/view/248845