United States. Bureau of the Budget and United States. Office of Management and Budget. "Composition of Budget Outlays in Current and Constant Prices," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year 1981," Budget of the United States Government (January 28, 1980) : 629-629. https://fraser.stlouisfed.org/title/54/item/19035/toc/100128 , accessed on April 23, 2024.