มีทรัพย์ทอง ช., and ศิริวงศ์ พ. “The Meaning and Origin of Volunteer Activities : Process and Guidelines of Students in Faculty of Business Administration. Huachiew Chalermprakiet University”. Business Review Journal, vol. 8, no. 2, Dec. 2016, pp. 165-81, https://so01.tci-thaijo.org/index.php/bahcuojs/article/view/125595.