Krongchon N ,Piboon K ,Oppawongsapat D. “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, no. 4 (August 1, 2017): 89–98. Accessed April 20, 2024. https://he02.tci-thaijo.org/index.php/JDMS/article/view/248845.