Choeydee, S., and W. Pathumcharoenwattana. “Development of a Non-Formal Education Activity for the Elderly of the Aging Club at Sirikit Hospital”. An Online Journal of Education, vol. 17, no. 1, June 2022, p. OJED1701036 (13 pages) doi: 10.14456/ojed.2022.39, https://so01.tci-thaijo.org/index.php/OJED/article/view/259654.