Buranapuntalug, Sasipa, Wattana Jalayondeja, and Rungchai Chaunchaiyakul. 2013. “Effectiveness of Respiratory Resistance Training Device on Respiratory Muscles Strength and Endurance”. Archives of Allied Health Sciences 25 (2). Khon Kaen, Thailand:181-92. https://he01.tci-thaijo.org/index.php/ams/article/view/66305.