American Booksellers Association
(Copyright 2007)
http://www.BookWeb.org/

Audit Bureau of Circulations
(2007 Audit Bureau of Circulations)
http://www.accessabc.com/

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
(FY 2005 Public Libraries Survey and Library Statistics Program, released 2007)
(2004-2005 Public School District)
http://nces.ed.gov/

Scarborough Research USA+2007 Release
http://www.scarborough.com

U.S. Census Bureau
United States Department of Commerce
(United States Census 2006)
http://www.census.gov/

Yellow Pages, Inc.
(Copyright 2007 Yellow Pages, Inc.)
http://www.yellowpagesinc.com/