Reference

 

http://rukgunmai.wordpress.com/2013/01/08/%E0%B8%9C%E0%B8%A5%E0%B8%B4%E0%B8%95%E0%B8%A0%E0%B8%B1%E0%B8%93%E0%B8%91%E0%B9%8C%E0%B8%88%E0%B8%B2%E0%B8%81%E0%B8%9B%E0%B8%B4%E0%B9%82%E0%B8%95%E0%B8%A3%E0%B9%80%E0%B8%A5%E0%B8%B5%E0%B8%A2%E0%B8%A1/

 

http://th.wikipedia.org/wiki/ปิโตรเลียม#.E0.B8.A8.E0.B8.B1.E0.B8.9E.E0.B8.97.E0.B8.A1.E0.B8.B9.E0.B8.A5.E0.B8.A7.E0.B8.B4.E0.B8.97.E0.B8.A2.E0.B8.B2

 

http://www.คนเก่งคนดีcom/%E0%B9%81%E0%B8%AB%E0%B8%A5%E0%B9%88%E0%B8%87%E0%B8%9E%E0%B8%A5%E0%B8%B1%E0%B8%87%E0%B8%87%E0%B8%B2%E0%B8%99%E0%B9%83%E0%B8%99-aec-%E0%B8%AD%E0%B8%99%E0%B8%B2%E0%B8%84%E0%B8%95%E0%B8%9E%E0%B8%A5/