http://www.usa.gov/Agencies/Federal/All_Agencies/index.shtml

http://en.wikipedia.org/wiki/List_of_United_States_federal_agencies

http://www.whitehouse.gov/government/independent-agencies.html

http://www.usa.gov/Agencies.shtml

http://www.govbenefits.gov/govbenefits_en.portal?_nfpb=true&_pageLabel=gbcc_page_locate_federal&_nfls=false

http://www.answers.com/topic/federal-agency-germany

http://www.gpoaccess.gov/agencies.html

http://en.wikipedia.org/wiki/Independent_Agencies_of_the_United_States_Government

http://www.gao.gov/fedagencies.html

http://www.lib.lsu.edu/gov/fedgov.html