APA

United States, . (1974). Clean air act oversight: hearings before the Subcommittee on Environmental Pollution of the Committee on Public Works, United States Senate, Ninety-third Congress, second session. Washington: U.S. Govt. Print. Off.

Chicago

United States, . 1974. Clean air act oversight: hearings before the Subcommittee on Environmental Pollution of the Committee on Public Works, United States Senate, Ninety-third Congress, second session. Washington: U.S. Govt. Print. Off.

Harvard

United States, . (1974). Clean air act oversight: hearings before the Subcommittee on Environmental Pollution of the Committee on Public Works, United States Senate, Ninety-third Congress, second session. Washington: U.S. Govt. Print. Off.

MLA

United States, . Clean air act oversight: hearings before the Subcommittee on Environmental Pollution of the Committee on Public Works, United States Senate, Ninety-third Congress, second session. Washington: U.S. Govt. Print. Off. 1974.