แหล่งที่มา

http://www.school.net.th/library/snet6/envi2/subwater/subwater.htm

http://th.wikipedia.org/wiki/%E0%B8%99%E0%B9%89%E0%B8%B3%E0%B8%94%E0%B8%B5

http://th.wikipedia.org/wiki/%E0%B8%97%E0%B8%A3%E0%B8%B1%E0%B8%9E%E0%B8%A2%E0%B8%B2%E0%B8%81%E0%B8%A3%E0%B8%99%E0%B9%89%E0%B8%B3

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