APA

United States, . (2016). Ensuring and enhancing U.S. competitiveness while moving toward a clean energy economy: hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Eleventh Congress, first session, July 16, 2009. Washington: U.S. Government Publishing Office.

Chicago

United States, . 2016. Ensuring and enhancing U.S. competitiveness while moving toward a clean energy economy: hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Eleventh Congress, first session, July 16, 2009. Washington: U.S. Government Publishing Office.

Harvard

United States, . (2016). Ensuring and enhancing U.S. competitiveness while moving toward a clean energy economy: hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Eleventh Congress, first session, July 16, 2009. Washington: U.S. Government Publishing Office.

MLA

United States, . Ensuring and enhancing U.S. competitiveness while moving toward a clean energy economy: hearing before the Committee on Environment and Public Works, United States Senate, One Hundred Eleventh Congress, first session, July 16, 2009. Washington: U.S. Government Publishing Office. 2016.