บรรณานุกรม

https://kru1plaka.wordpress.com/k21/k231/
http://demhot088.blogspot.com/2010/09/blog-post.html
https://th.wikipedia.org/wiki/%E0%B8%9E%E0%B8%A5%E0%B8%B2%E0%B8%AA%E0%B8%95%E0%B8%B4%E0%B8%81