United States. Office of Management and Budget. "Direct Loan Obligations of the Federal Government," in United States. Office of Management and Budget. "Fiscal Year 1988," Historical Tables, Budget of the United States Government (January 5, 1987) : 280-300. https://fraser.stlouisfed.org/title/383/item/6414/toc/289902 , accessed on April 24, 2024.