Santiphop, T., and U. Pattaravanich. “An Analysis of Factors to Improve the Capacity and Value of Older Persons in Thailand”. Journal of Population and Social Studies [JPSS], vol. 24, no. 2, July 2016, pp. 66-80, https://so03.tci-thaijo.org/index.php/jpss/article/view/102293.