Wongkeaw, S., sirirat Panuthai, and P. Nanasilp. “Factors Associated With Physical Activity Among Older Persons With Knee Osteoarthritis Stage III”. Nursing Journal CMU, vol. 50, no. 1, Mar. 2023, pp. 216-29, https://he02.tci-thaijo.org/index.php/cmunursing/article/view/262153.