APA

United States, . (2019). States' role in protecting air quality: principles of cooperative federalism : hearing before the Subcommittee on Clean Air and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Sixteenth Congress, first session, March 5, 2019. Washington: U.S. Government Publishing Office.

Chicago

United States, . 2019. States' role in protecting air quality: principles of cooperative federalism : hearing before the Subcommittee on Clean Air and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Sixteenth Congress, first session, March 5, 2019. Washington: U.S. Government Publishing Office.

Harvard

United States, . (2019). States' role in protecting air quality: principles of cooperative federalism : hearing before the Subcommittee on Clean Air and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Sixteenth Congress, first session, March 5, 2019. Washington: U.S. Government Publishing Office.

MLA

United States, . States' role in protecting air quality: principles of cooperative federalism : hearing before the Subcommittee on Clean Air and Nuclear Safety of the Committee on Environment and Public Works, United States Senate, One Hundred Sixteenth Congress, first session, March 5, 2019. Washington: U.S. Government Publishing Office. 2019.