United States. President and Council of Economic Advisers (U.S.). "Interest Bearing Public Debt by Kind of Obligation," in United States. President and Council of Economic Advisers (U.S.). "1977," Economic Report of the President (1977) : 280-280. https://fraser.stlouisfed.org/title/45/item/8148/toc/329687 , accessed on June 8, 2023.