Suttikeeree, P. ., S. . Tangsujjapoj, and K. . Polsorn. “EFFECTS OF LEISURE EDUCATION PROGRAM PARTICIPATION ON VOLUNTEERING IN HIGH SCHOOL STUDENTS”. Academic Journal of Thailand National Sports University, vol. 14, no. 1, Dec. 2021, pp. 237-48, https://he02.tci-thaijo.org/index.php/TNSUJournal/article/view/255356.