http://esa.un.org/wpp/documentation/pdf/WPP2012_%20KEY%20FINDINGS.pdf

This UN population information site contains a recent updating of the world population estimates and projections.

http://siteresources.worldbank.org/HEALTHNUTRITIONANDPOPULATION/Resources/281627-1095698140167/PopulationDiscussionPaperApril07Final.pdf

This site contains a discussion of world population growth provided by the World Bank.

http://www.uic.edu/depts/lib/specialcoll/services/lhsc/ead/011-10-20-01f.html

Here you will find a wealth of material on world population history, as well as projections, provided by the Geography Department of the University of Illinois at Chicago.

https://www.facingthefuture.org/IssuesSolutions/PopulationCarryingCapacity/PopulationFastFacts/tabid/301/Default.aspx#.VasYjflViko

Here is another source of information of a number of population facts and the history of the world's population. Provides URLs for a number of population-related web sites.

http://www.demographia.com/

Demographia.com, a private organization, provides links to number of URLs a history of the U.S. population along with data on the nation's leading cities, with focus on city planning.

http://www.hist.umn.edu/~rmccaa/laphb/laphb.htm

This address takes you to the Latin American Population History Bulletin.

http://www.populationinstitute.org/?gclid=Cj0KEQjwiJiiBRDh3Z-ctPfS5MgBEiQAAlkbQruRtYezdNShY-f5zAmV0W6S_pFim1Jh2QfBw_40DwaArzu8P8HAQ

The Population Council maintains this page, dedicated to a discussion of population growth.