- http://www.census.gov/ipc/www/idb/
- http://www.loc.gov/rr/business/census/intlcensus.html
- http://geography.about.com/cs/worldpopulation/
- http://libguides.rutgers.edu/content.php?pid=124274&sid=1098413
- http://www.un.org/esa/population/
- http://unstats.un.org/unsd/default.htm
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