Indratula, R., W. Lertwatthanawilat, B. Promphuk, A. Kardosod, and W. Womgcharoen. “Predicting Factors of Self-Management Among Persons With Chronic Back Pain”. Nursing Journal CMU, vol. 47, no. 4, Dec. 2020, pp. 470-82, https://he02.tci-thaijo.org/index.php/cmunursing/article/view/246480.