Lietz, Juergen. “Thai-German Research Project WADIS Recommendations for the Investigation of Abandoned and Proposed Waste Disposal Sites in Thailand”. Journal of Engineering, RMUTT 3 (June 30, 2003): 94–101. Accessed May 19, 2024. https://ph01.tci-thaijo.org/index.php/jermutt/article/view/242360.