• http://www.trang.psu.ac.th/asean/?p=262

 

• https://suwannasabeloved.wordpress.com/%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%81%E0%B8%95%E0%B9%88%E0%B8%87%E0%B8%81%E0%B8%B2%E0%B8%A2%E0%B8%82%E0%B8%AD%E0%B8%87%E0%B8%9B%E0%B8%A3%E0%B8%B0%E0%B9%80%E0%B8%97%E0%B8%A8%E0%B8%AA%E0%B8%A1%E0%B8%B2/

 

• http://hilight.kapook.com/view/73561