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ONLINE  REFERENCES
The most visited reference websites in the world: Especially in scientific studies you need previously written, drawn,ie, created works. The scientific value of these works depends on mostly where they are published. There are several websites, however you have to consider some crieteria to trust the these websites. Websites of the universities, technological centers, governmental organizations, are most reliable reference sources.You can find below the list of the most visited reference websites.
University of Oxford   http:// www.ox.ac.uk/ 
Columbia University  http:// www.columbia.edu 
The Library of Congress  http:// www.loc.gov 
University of Florida   http:// www.ufl.edu/ 
QwestDex:  www.qwestdex.com 
University of Washington  http:// www.washington.edu 
FastWeb  http:// www.fastweb.com 
University of California     http:// www.ucla.edu 
University of Pennsylvania  http:// www.upenn.edu 
U.S. Department of Education   http:// www.ed.gov/index.jsp 

National Geographic  http:// www.nationalgeographic.com/ 
How Stuff Works  http:// www.howstuffworks.com/ 
University of Illinois: www.uiuc.edu/ 
InfoUSA    http:// www.infousa.com/ 
World Wide Web Consortium  http:// www.w3.org 
Experts Exchange   www.experts-exchange.com   
Massachusetts Institute of Technology    http:// www.mit.edu 
My Virtual Reference Desk   http:// www.refdesk.com/ 
SMARTpages.com www.smartpages.com 
Entrez-PubMed  http:// www.ncbi.nlm.nih.gov/entrez/query.fcgi
Switchboard Incorporated   http:// www.switchboard.com/ 
National Library of Medicine  http:// www.nlm.nih.gov 
InfoSpace, Inc.   http:// www.infospace.com/ 
National Center for Infectious Diseases  http:// www.cdc.gov/ncidod/index.htm 
MIT Media Laboratory  http:// www.media.mit.edu/ 
  Wolfram Research, Inc.    http:// www.wolfram.com/ 
Food and Agriculture Organization  http://www.fao.org/
Bureau of Meteorology/  http:// www.bom.gov.au  
Global Geoscience Services    http:// www.ggsi.com / 
New Scientist    http:// www.newscientist.com / 
SPACE.com    http:// www.space.com  
On-Line Library of Literature   http://www.literature.org/ 
United States Geological Survey   http:// www.usgs.gov  
US Census Bureau)  http:// www.census.gov / 
Universal Library   http://www.ulib.org/ 
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