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21.  http://kroosuveera.blogspot.com/2011/09/blog
-post_13.html
 http://thanapongkiatsujja.blogspot.com/2012/07/3.html
 http://dc338.4shared.com/doc/a4t84gCH/preview.html
 http://kruoong.blogspot.com/2011/07/blog-post_25.html
 http://www.bothong.ac.th/manatsanan603/main.html
 http://krumewstp.wordpress.com/%E0%B8%95%E0%B8%B1%E0%B8%A7%E0%B8%AD
%E0%B8%A2%E0%B9%88%E0%B8%B2%E0%B8%87%E0%B8%8A%E0%B8%B7%E0%B
9%88%E0%B8%AD%E0%B9%82%E0%B8%84%E0%B8%A3%E0%B8%87%E0%B8%87%E
0%B8%B2%E0%B8%99%E0%B8%84%E0%B8%AD%E0%B8%A1/
 http://www.thaic-130.net/forums/showthread.php?t=979&langid=1
http://august-thank.blogspot.com/2012/01/blog-post_207.html
 http://namkwanmay.wordpress.com/2011/02/08/%E0%B8%9B%E0%B8%A3%E0%B8%B0
%E0%B9%80%E0%B8%A0%E0%B8%97%E0%B8%82%E0%B8%AD%E0%B8%87%E0%B
9%82%E0%B8%84%E0%B8%A3%E0%B8%87%E0%B8%87%E0%B8%B2%E0%B8%99%E
0%B8%84%E0%B8%AD%E0%B8%A1%E0%B8%9E%E0%B8%B4%E0%B8
 https://sites.google.com/site/luksaduankhorngnganthekhnoloyi/tawxyang-khorng-ngan-
khxmphiwtexr