Tanwanchai, R., Pluemcharoen, W., Pichyapaiboon, P. and Sukarawan, S. 2006. Development of Local Curriculum on Natural Resources and Environmental Conservation for Schools Surrounding the Boundary of Dong-Yai Wildlife Sanctuary in Buri Ram Province. Kasetsart Journal of Social Sciences. 27, 2 (Dec. 2006), 175–188.