Audit Bureau of Circulations
(2008 Audit Bureau of Circulations)
http://www.accessabc.com/

Institute of Museum and Library Services (IMLS)
(FY2010)
http://www.imls.gov/

MediaFinder.Com of Oxbridge Communications Inc.
(The site searches the National Directory of Magazines [2007] and the Standard Periodical Directory [2007].)
http://www.mediafinder.com

National Center for Education Statistics (NCES)
(December 2-13, 2012)
http://nces.ed.gov/

Scarborough Research USA+2008 Release
http://www.scarborough.com

U.S. Census Bureau
United States Department of Commerce
(United States Census 2007)
http://www.census.gov/

Yellow Pages, Inc.
(Copyright 2008 Yellow Pages, Inc.)
http://www.yellowpagesinc.com/