APA

United States, . (2007). Energy security and oil dependence: hearing before the Committee on Foreign Relations, United States Senate, One Hundred Ninth Congress, second session, May 16, 2006. Washington: U.S. Government Printing Office.

Chicago

United States, . 2007. Energy security and oil dependence: hearing before the Committee on Foreign Relations, United States Senate, One Hundred Ninth Congress, second session, May 16, 2006. Washington: U.S. Government Printing Office.

Harvard

United States, . (2007). Energy security and oil dependence: hearing before the Committee on Foreign Relations, United States Senate, One Hundred Ninth Congress, second session, May 16, 2006. Washington: U.S. Government Printing Office.

MLA

United States, . Energy security and oil dependence: hearing before the Committee on Foreign Relations, United States Senate, One Hundred Ninth Congress, second session, May 16, 2006. Washington: U.S. Government Printing Office. 2007.