United States. Bureau of the Budget and United States. Office of Management and Budget. "Investing in Human Capital," in United States. Bureau of the Budget and United States. Office of Management and Budget. "Fiscal Year 1991," Budget of the United States Government (January 29, 1990) : 99-115. https://fraser.stlouisfed.org/title/54/item/18997/content/pdf/bus_1991_sec1/toc/38864 , accessed on April 26, 2024.