สุนทรกิจ ว., บุญปู่ ส. and แก้วทองใหญ่ ย. (2021) “A Study of Organizing Activities to Promote Volunteer Spirit of Secondary School Students in Chomthong District of Bangkok”, Mahamakut Graduate School Journal, 19(1), p. 13. Available at: https://so04.tci-thaijo.org/index.php/mgsj/article/view/252396 (Accessed: 7 May 2024).