Thepparp, R., and H. Uemura. “Age-friendly Community and Opportunities for Meaningful Life of the Elderly: Lessons Learned from Hua-Ngum Sub-district, Chiang Rai, Thailand”. Journal of Social Work and Social Administration, vol. 25, no. 1, Feb. 2019, pp. 157-02, https://so04.tci-thaijo.org/index.php/swjournal/article/view/170599.