APA

United States, . (2007). Potential effects of a flat federal income tax in the District of Columbia: hearing before a Subcommittee of the Committee on Appropriations, United States Senate, One Hundred Ninth Congress, second session, special hearings, March 8 ... March 30, 2006, Washington, DC. Washington: U.S. G.P.O.

Chicago

United States, . 2007. Potential effects of a flat federal income tax in the District of Columbia: hearing before a Subcommittee of the Committee on Appropriations, United States Senate, One Hundred Ninth Congress, second session, special hearings, March 8 ... March 30, 2006, Washington, DC. Washington: U.S. G.P.O.

Harvard

United States, . (2007). Potential effects of a flat federal income tax in the District of Columbia: hearing before a Subcommittee of the Committee on Appropriations, United States Senate, One Hundred Ninth Congress, second session, special hearings, March 8 ... March 30, 2006, Washington, DC. Washington: U.S. G.P.O.

MLA

United States, . Potential effects of a flat federal income tax in the District of Columbia: hearing before a Subcommittee of the Committee on Appropriations, United States Senate, One Hundred Ninth Congress, second session, special hearings, March 8 ... March 30, 2006, Washington, DC. Washington: U.S. G.P.O. 2007.