Sapa, S., S. Supawan, and C. Boonwatthanakul. “A Model for Organizing Recreational Activities to Develop Adaptability of the Elderly in Mueang District, Udon Thani Province”. STOU Education Journal, vol. 13, no. 2, Dec. 2020, pp. 145-56, https://so05.tci-thaijo.org/index.php/edjour_stou/article/view/173766.