APA

United States, . (2002). Homeland security: hearings before the Committee on Appropriations, United States Senate, One Hundred Seventh Congress, second session : special hearings, April 10, 2002, Washington, DC ; April 11, 2002, Washington, DC. Washington: U.S. Government Printing Office.

Chicago

United States, . 2002. Homeland security: hearings before the Committee on Appropriations, United States Senate, One Hundred Seventh Congress, second session : special hearings, April 10, 2002, Washington, DC ; April 11, 2002, Washington, DC. Washington: U.S. Government Printing Office.

Harvard

United States, . (2002). Homeland security: hearings before the Committee on Appropriations, United States Senate, One Hundred Seventh Congress, second session : special hearings, April 10, 2002, Washington, DC ; April 11, 2002, Washington, DC. Washington: U.S. Government Printing Office.

MLA

United States, . Homeland security: hearings before the Committee on Appropriations, United States Senate, One Hundred Seventh Congress, second session : special hearings, April 10, 2002, Washington, DC ; April 11, 2002, Washington, DC. Washington: U.S. Government Printing Office. 2002.