United States. President and Council of Economic Advisers (U.S.). "Indexes of Output per Man-hour and Related Data," in United States. President and Council of Economic Advisers (U.S.). "1962," Economic Report of the President (1962) : 252-252. https://fraser.stlouisfed.org/title/45/item/8133/toc/428621 , accessed on April 25, 2024.