1. http://www.brr.ac.th/~brrweb/knowledge/physic-cyber/lessonplan/manual01.pdf
2. http://www.nb2.go.th/~suwanpit/sc/e-leaning/wave/
3. http://khankhammuen.wordpress.com/2010/03/30/%E0%B9%80%E0%B8%AD%E0%B8%81%E0%B8%AA%E0%B8%B2%E0%B8%A3%E0%B8%9B%E0%B8%A3%E0%B8%B0%E0%B8%81%E0%B8%AD%E0%B8%9A%E0%B8%81%E0%B8%B2%E0%B8%A3%E0%B9%80%E0%B8%A3%E0%B8%B5%E0%B8%A2%E0%B8%99%E0%B8%81%E0%B8%B2/
4. http://blake.prohosting.com/pstutor/physics/wave/wave_concept.html
5. http://learners.in.th/blog/kik46312526-2
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