United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year 2009 : Department of Homeland Security," Budget of the United States Government (February 4, 2008). https://fraser.stlouisfed.org/title/54/item/19055/content/pdf/BUDGET-2009-BUD-16, accessed on March 29, 2024.
United States Government Printing Office