Oumnoi, H., Un-Ob, P., Jiawiwatku, U., & Porvornsompong, P. (2015). A Learning Process of Volunteer Spirit Development in Youths: The Rak Khao Chamao Group. Thammasat Review, 16(2), 35–54. Retrieved from https://sc01.tci-thaijo.org/index.php/tureview/article/view/40752