Promwa, N. “The Development of an Elderly Care Competency Model for Caregivers at Tambon Pamamuong, Aumphur Muaengtak ,Tak Province”. NU Journal of Nursing and Health Sciences, vol. 12, no. 3, Feb. 2019, pp. 71-82, https://he01.tci-thaijo.org/index.php/NurseNu/article/view/173062.