wordnetweb.princeton.edu/perl/webwn
http://asms.k12.ar.us/classes/humanities/amstud/97-98/telecom/telephone_and_telegraph.html (3rd march 2010)
www.emc.mricopa.edu/faculty/farabee/BIOBK/BioBookEnerl.html ( last modified on Wednesday 6th June 2007)).
physorg.com- August 2nd 2008
web dictionary
google.com
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