อ้างอิง

http://www.learners.in.th/blogs/posts/460003

http://www2.udru.ac.th/~musicnote/dontreethai.htm

http://www.sadetmusic.com/music/music.html

https://www.google.co.th/search?q=%E0%B8%94%E0%B8%99%E0%B8%95%E0%B8%A3%E0%B8%B5%E0%B9%84%E0%B8%97%E0%B8%A2&biw=1680&bih=960&tbm=isch&tbo=u&source=univ&sa=X&ei=2evjUcSyB47yrQeH94CgDw&sqi=2&ved=0CEAQsAQ