United States. President and Council of Economic Advisers (U.S.). "Gross National Product or Expenditure, in 1958 Prices," in United States. President and Council of Economic Advisers (U.S.). "1971," Economic Report of the President (1971) : 204-205. https://fraser.stlouisfed.org/title/45/item/8142/toc/141930 , accessed on March 19, 2024.