“History of the Income Tax in the United States”, Infoplease, 2007, http://www.infoplease.com/ipa/A0005921.html.
408
Roberton Williams, “The Numbers: What Are the Federal Government’s Sources of Revenue?” The Tax Policy Briefing Book: A Citizens’ Guide for the Election, and Beyond (Tax Policy center: Urban Institute and Brookings Institution, 13 сентября 2011 г.), http://www.taxpolicycenter.org/briefing-book/background/numbers/revenue.cfm.
