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Sources
  • Official UNFPA Day of 6 Billion Site. http://www.unfpa.org/6billion/index.htm.
  • Opposition to Day of Six Billion-Committee on Women, Population, and the Environment. http://www.cwpe.org/node/79.
  • The Day of Six Billion-International Humanist and Ethical Union. http://www.iheu.org/node/364.
  • "World Population Reaches 6 Billion"-BBC. http://news.bbc.co.uk/2/hi/471908.stm.