PrintMuehrcke, P. and Muehrcke, J.O. 1992: Map Use: Reading, Analysis, and Interpretation. 3rd edition. Madison, WI: JP Publications.
Slocum, T., McMaster, R., Kessler, F. and Howard, H.H. 2009: Thematic Cartography and Visualization. Upper Saddle River, NJ: Prentice Hall.
Brewer, C. & Suchan, T., (2001). Mapping census 2000: The geography of U. S. diversity. U. S. Census Bureau, Census Special Reports, Series CENSR/01-1. Washington, D. C.: U.S. Government Printing Office.
Chrisman, N. (2002). Exploring geographic information systems. (2nd ed.). New York: John Wiley & Sons, Inc.
Monmonier, M. (1995). Drawing the line: Tales of maps and cartocontroversy. New York: Henry Holt and Company.
Roberts, S. (1994). Who we are: A portrait of America based on the latest U.S. census. New York: Times Books.
U.S. Census Bureau (n. d.). Retrieved July 19, 1999, from http://www.census.gov
U.S. Census Bureau (1996). Federal expenditures by state for fiscal year 1995. Retrieved May 9, 2006, from www.census.gov/prod/2/gov/fes95rv.pdf
U.S. Census Bureau (2005). American FactFinder Retrieved July, 19, 1999, from http://factfinder.census.gov
U.S. Census Bureau (n. d.). American FactFinder Retrieved August 2, 2012, from http://factfinder2.census.gov/faces/nav/jsf/pages/using_factfinder5.xhtml
U.S. Census Bureau (2008). A Compass for understanding and using American Community Survey data: What general users need to know. U.S. Government Printing Office, Washington DC, 2008.