Sources

References The Gale Encyclopedia of Science. Bill Freedman. Ed K. Lee Lerner and Brenda Wilmoth Lerner. Vol. 5. 3rd. Detroit:  Gale, 2004 http://costaricacloseup.com/2012/03/31/costa-rica-red-tide-continues-havoc/

http://start1.org/red-tide/

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http://www.google.com/imgres?q=red+tide&um=1&hl=en&client=safari&sa=N&rls=en&biw=1275&bih=680&

Red Alert on Red Tide. (2006). New Scientist, 18992533), 4.

Schrope, M. (2008). Oceanography: Red tide rising. Nature, 452(7183),24.