United States. President and Council of Economic Advisers (U.S.). "Changes in Productivity and Related Data, Private Business Economy," in United States. President and Council of Economic Advisers (U.S.). "1977," Economic Report of the President (1977) : 235-235. https://fraser.stlouisfed.org/title/45/item/8148/toc/329651 , accessed on June 8, 2023.