UMIŃSKI, Paweł. Potential Introduction of Flat Tax on Personal Income in the United States of America in 2007 and a Distribution of Revenue. Equilibrium. Equilibrium. Quarterly Journal of Economics and Economic Policy. Online. 1 December 2010. Vol. 5, no. 2, pp. 221-231. [Accessed 23 July 2024]. DOI 10.12775/EQUIL.2010.037.