References Cited

Livi-Bacci, M. 2007. A Concise History of World Population. 4th ed. 
     Blackwell Publishing, Malden, MA.

http://www.census.gov/ipc/www/idbsum.html. TITLE: IDB Summary Demographic 
     Data. Author: U.S. Census Bureau. This page was last updated 24 
     August 2006. This URL contains a link to population information for 
     most (if not all) countries in the world. This was useful in finding  
     data for multiple countries so as to compare them and make 
     generalizations about the first, second, and third worlds. Accessed 
     4 April 2007.

http://www.census.gov/cgi-bin/ipc/idbsum.pl?cty=RS. TITLE: Population 
     Summary for Russia. Author: U.S. Census Bureau. This page was last 
     updated 24 August 2006. This URL contains data for demographic 
     indicators as well as the population distribution for 2005 and the 
     projected distribution for 2025. This URL also included population 
     pyramids for both 2005 and 2025. Accessed 4 April 2007.

http://www.census.gov/cgi-bin/ipc/idbsum.pl?cty=SG. TITLE: Population 
     Summary for Senegal. Author: U.S. Census Bureau. This page was last 
     updated 24 August 2006. This URL contains data for demographic 
     indicators as well as the population distribution for 2005 and the 
     projected distribution for 2025. This URL also included population 
     pyramids for both 2005 and 2025. Accessed 4 April 2007.

http://www.census.gov/cgi-bin/ipc/idbsum.pl?cty=US. TITLE: Population 
     Summary for United States. Author: U.S. Census Bureau. This page was 
     last updated 24 August 2006. This URL contains data for demographic 
     indicators as well as the population distribution for 2005 and the 
     projected distribution for 2025. This URL also included population 
     pyramids for both 2005 and 2025. Accessed 4 April 2007.

http://www.census.gov/ipc/www/popclockworld.html. TITLE: World POPClock
     Projection. Author: U.S. Census Bureau. This page was last updated 22 
     November 2006. This URL contains data for the total population of the 
     world as well as monthly world population figures. Every time the 
     page is reloaded, a new estimate is given for the current world 
     population. Accessed 14 April 2007.