อินทร์แก้ว ช. (2019) “Effectiveness of the program to reduce knee pain in osteoarthritis elderly patients in Chang-sai health promotion hospital”, Region 11 Medical Journal, 33(2), pp. 293–302. available at: https://he02.tci-thaijo.org/index.php/Reg11MedJ/article/view/215840 (accessed: 20 September 2026).