http://blog.eduzones.com/imp/77127

http://www.lib.ru.ac.th/miscell/index.html

http://sarakade.itgo.com/regular.html

http://dnfe5.nfe.go.th/ilp/42010/index.htm

http://www.bloggang.com/?category=21

http://school.obec.go.th/nkwy/tiplearn/old/index.htm

http://th.wikipedia.org/wiki/%E0%B9%81%E0%B8%9E%E0%B8%99%E0%B8%94%E0%B9%89%E0%B8%B2%E0%B8%A2%E0%B8%B1%E0%B8%81%E0%B8%A9%E0%B9%8C

http://www.panyathai.or.th/wiki/index.php/%E0%B8%AB%E0%B8%A1%E0%B8%B5%E0%B9%81%E0%B8%9E%E0%B8%99%E0%B8%94%E0%B9%89%E0%B8%B2