Keawsengsai, Angkanarat, Khanokporn Suchamvang, and Paradee Nanasilp. 2020. “Effect of Iyengar Yoga Exercise on Severity of Knee Osteoarthritis Among the Older Persons”. Nursing Journal CMU 47 (1):175-84. https://he02.tci-thaijo.org/index.php/cmunursing/article/view/240743.