Silachan, N., Pluemcharoen, W., Pichyapaiboon, P., & Sukarawan, S. (2006). Development of a Workshop Curriculum on Environmental Education Project for Teachers of Schools Surrounding The Boundary of Dong-Yai Wildlife Sanctuary, Buri Ram Province. Kasetsart Journal of Social Sciences, 27(2), 163–174. retrieved from https://so04.tci-thaijo.org/index.php/kjss/article/view/246378