12 บรรณำนุกรม http://sittichai25351991.blogspot.com/2014/03/blog- post_4111.html http://i2.ytimg.com/vi/EsBXYHfYgmI/mqdefault.jpg https://sites.google.com/a/srp.ac.th/srp30780/ https://images.thaiza.com/16/16_20120817112548..jpg