ธนโชคจรัสพงษ์ ธ. and สถิตวิทยานันท์ ส. (2017) “Background and Roles of Volunteer Spirit Teachers towards Hill Tribe Students Development in Tha Song Yang District, Tak Province”, Journal of Humanities and Social Sciences, Rajapruk University, 3(1), pp. 107–116. Available at: https://so03.tci-thaijo.org/index.php/rpu/article/view/112567 (Accessed: 3 May 2024).