Kongsombun, Usa, Suparb Aree-Ue, and Phichpraorn Youngcharoen. 2020. “Depression, Fatigue, and Physical Performance Among Older Adults With Knee Osteoarthritis: A Correlational Study”. Nursing Research and Innovation Journal 25 (3):310-25. https://he02.tci-thaijo.org/index.php/RNJ/article/view/178959.