Thongkeaw, W., Kwanboonchan, S., Chaivichit, S., & Tangsujjapoj, S. (2019). Effects of Participation in Outdoor Recreation Program on the Enhancement of Leadership of Youth Tourism Volunteers. Journal of International Studies, Prince of Songkla University, 9(1), 138–158. Retrieved from https://so03.tci-thaijo.org/index.php/jis/article/view/203852