รัตนกัลยา ขนิษฐา. “Coaching on Breathing Exercise by Applying Incentive Spirometer in Post-Operative Patients”. Journal of The Royal Thai Army Nurses 19 (August 30, 2018): 1–9. accessed September 20, 2026. https://he01.tci-thaijo.org/index.php/JRTAN/article/view/155695.