1. http://th.wikipedia.org/wiki/%E0%B8%84%E0%B8%A5%E0%B8%B7%E0%B9%88%E0%B8%99
2. http://www.rmutphysics.com/physics/oldfront/88/wave.html
3. http://www.bkw.ac.th/content/snet3/saowalak/wave/wave.htm
4.http://www.icphysics.com/modules.php?name=Content&pa=showpage&pid=54
5. http://www.bs.ac.th/lab2000/physicweb/sonic.htm
6. http://www.rsu.ac.th/science/physics/pom/physics_2/wave/wave_1.htm
7. http://physicsforth.spaces.live.com/blog/cns!653E82EA9340DFA3!2151.entry
8. http://www.electron.rmutphysics.com/teaching-glossary/index.php?option=com_content&task=view&id=1058&Itemid=11
9. http://www.absorn.ac.th/e-learning/ebook/supatra/b5.htm
10. http://physicsforth.spaces.live.com/Blog/cns!653E82EA9340DFA3!683.entry
2. http://www.rmutphysics.com/physics/oldfront/88/wave.html
3. http://www.bkw.ac.th/content/snet3/saowalak/wave/wave.htm
4.http://www.icphysics.com/modules.php?name=Content&pa=showpage&pid=54
5. http://www.bs.ac.th/lab2000/physicweb/sonic.htm
6. http://www.rsu.ac.th/science/physics/pom/physics_2/wave/wave_1.htm
7. http://physicsforth.spaces.live.com/blog/cns!653E82EA9340DFA3!2151.entry
8. http://www.electron.rmutphysics.com/teaching-glossary/index.php?option=com_content&task=view&id=1058&Itemid=11
9. http://www.absorn.ac.th/e-learning/ebook/supatra/b5.htm
10. http://physicsforth.spaces.live.com/Blog/cns!653E82EA9340DFA3!683.entry
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