McNulty, John K.: Flat Tax, Consumption Tax, Consumption-Type Income Tax Proposals in the United States: A Tax Policy Discussion of Fundamental Tax Reform. California Law Review, joulukuu 2000, 88. vsk, nro 6. Artikkelin verkkoversio. Viitattu 27.9.2018 (englanniksi). (Arkistoitu – Internet Archive)
Nyberg, Martti: Tasavero. Yksinkertainen, oikeudenmukainen ja kasvua tukeva verojärjestelmä. Helsinki: Taloustieto Oy : Yliopistopaino, 2006. ISBN 951-628-438-8. Teoksen verkkoversio.
Alvin Rabushka. "Flat and Flatter Taxes Continue to Spread Around the Globe." 16 January 2007.Archived copyhoover.org. Arkistoitu 7.7.2007. Viitattu 24 .6.2007.
"The lowest flat corporate and personal income tax rates." Invest Macedonia government web site. Retrieved 6 June 2007. Archived copyinvestinmacedonia.org. Arkistoitu 24.2.2007. Viitattu 6 .6.2007.
Murphy, Richard: A flat tax for the UK? The implications of simplification. ACCA (Association of Chartered Certified Accountants) Discussion Paper. The Association of Chartered Certified Accountants. Teoksen verkkoversio (viitattu 27.9.2018 (englanniksi)).
McNulty, John K.: Flat Tax, Consumption Tax, Consumption-Type Income Tax Proposals in the United States: A Tax Policy Discussion of Fundamental Tax Reform. California Law Review, joulukuu 2000, 88. vsk, nro 6. Artikkelin verkkoversio. Viitattu 27.9.2018 (englanniksi). (Arkistoitu – Internet Archive)
Alvin Rabushka. "Flat and Flatter Taxes Continue to Spread Around the Globe." 16 January 2007.Archived copyhoover.org. Arkistoitu 7.7.2007. Viitattu 24 .6.2007.
"The lowest flat corporate and personal income tax rates." Invest Macedonia government web site. Retrieved 6 June 2007. Archived copyinvestinmacedonia.org. Arkistoitu 24.2.2007. Viitattu 6 .6.2007.