Punyasri, P., S. Thaotho, A. Lordkaew, K. Nakphalad, and P. Jedaman. “Strategies Development to Social Skills and Practices of Elderly on Health and Cultural Tourism in Learning Society”. Journal of Modern Learning Development, vol. 6, no. 5, June 2021, pp. 84-99, https://so06.tci-thaijo.org/index.php/jomld/article/view/249528.