ที่มาของข้อมูล

http://th.wikipedia.org/wiki/%E0%B9%80%E0%B8%A8%E0%B8%A3%E0%B8%A9%E0%B8%90%E0%B8%81%E0%B8%B4%E0%B8%88%E0%B8%9E%E0%B8%AD%E0%B9%80%E0%B8%9E%E0%B8%B5%E0%B8%A2%E0%B8%87

http://www.inspect9.moe.go.th/economic_king80.htm

http://www.trueplookpanya.com/true/knowledge_detail.php?mul_content_id=17608

http://www.krubanchang.com/index.php?lay=show&ac=article&Id=235452&Ntype=6