APA

United States, . (2012). Current and projected national security threats to the United States: hearing before the Select Committee on Intelligence of the United States Senate, One Hundred Twelfth Congress, first session, February 16, 2011. Washington: U.S. G.P.O.

Chicago

United States, . 2012. Current and projected national security threats to the United States: hearing before the Select Committee on Intelligence of the United States Senate, One Hundred Twelfth Congress, first session, February 16, 2011. Washington: U.S. G.P.O.

Harvard

United States, . (2012). Current and projected national security threats to the United States: hearing before the Select Committee on Intelligence of the United States Senate, One Hundred Twelfth Congress, first session, February 16, 2011. Washington: U.S. G.P.O.

MLA

United States, . Current and projected national security threats to the United States: hearing before the Select Committee on Intelligence of the United States Senate, One Hundred Twelfth Congress, first session, February 16, 2011. Washington: U.S. G.P.O. 2012.