APA

United States, . (2015). Preventing potential chemical threats and improving safety: oversight of the President's executive order on improving chemical facility safety and security : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Thirteenth Congress, second session, March 6, 2014. Washington: U.S. Government Publishing Office.

Chicago

United States, . 2015. Preventing potential chemical threats and improving safety: oversight of the President's executive order on improving chemical facility safety and security : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Thirteenth Congress, second session, March 6, 2014. Washington: U.S. Government Publishing Office.

Harvard

United States, . (2015). Preventing potential chemical threats and improving safety: oversight of the President's executive order on improving chemical facility safety and security : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Thirteenth Congress, second session, March 6, 2014. Washington: U.S. Government Publishing Office.

MLA

United States, . Preventing potential chemical threats and improving safety: oversight of the President's executive order on improving chemical facility safety and security : hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Thirteenth Congress, second session, March 6, 2014. Washington: U.S. Government Publishing Office. 2015.