เว็ปเรื่องคลื่น

http://radio.siamha.com/popupfm.php?station=station965

http://web.ku.ac.th/schoolnet/snet3/saowalak/wave/mechanical_wave/m_wave.htm

http://th.wikipedia.org/wiki/%E0%B8%84%E0%B8%A5%E0%B8%B7%E0%B9%88%E0%B8%99%E0%B8%AA%E0%B8%B6%E0%B8%99%E0%B8%B2%E0%B8%A1%E0%B8%B4

http://www.heart.kku.ac.th/sqshc/index.php?option=com_content&view=article&id=142:-ekg&catid=21:2009-10-02-04-48-35&Itemid=9

http://www.thaipost.net/news/030810/25655