United States. President and Council of Economic Advisers (U.S.). "Gross National Product: Receipts and Expenditures by Major Economic Groups," in United States. President and Council of Economic Advisers (U.S.). "1977," Economic Report of the President (1977) : 202-203. https://fraser.stlouisfed.org/title/45/item/8148/toc/329630 , accessed on June 8, 2023.