Malai, C., R. Chaiyoyingyong, P. Dangdomyouth, and S. Cheaplamp. “Factors Related to Depression Among Older Adults in Community, Ratchaburi Province”. Journal of Research in Nursing-Midwifery and Health Sciences, vol. 39, no. 3, Sept. 2019, pp. 67-76, https://he02.tci-thaijo.org/index.php/nur-psu/article/view/218955.