APA

United States, . (1999). Regional haze and mercury pollution: hearing before the Subcommittee on Clean Air, Wetlands, Private Property and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Fifth Congress, second session, October 1, 1998. Washington: U.S. Government Printing Office.

Chicago

United States, . 1999. Regional haze and mercury pollution: hearing before the Subcommittee on Clean Air, Wetlands, Private Property and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Fifth Congress, second session, October 1, 1998. Washington: U.S. Government Printing Office.

Harvard

United States, . (1999). Regional haze and mercury pollution: hearing before the Subcommittee on Clean Air, Wetlands, Private Property and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Fifth Congress, second session, October 1, 1998. Washington: U.S. Government Printing Office.

MLA

United States, . Regional haze and mercury pollution: hearing before the Subcommittee on Clean Air, Wetlands, Private Property and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Fifth Congress, second session, October 1, 1998. Washington: U.S. Government Printing Office. 1999.