Council of Economic Advisers (U.S.) , United States. Congress. Joint Committee on the Economic Report, 1946-1956 and United States. Congress. Joint Economic Committee, 1956-. "Productivity and Related Data, Business Sector," in Council of Economic Advisers (U.S.) , United States. Congress. Joint Committee on the Economic Report, 1946-1956 and United States. Congress. Joint Economic Committee, 1956-. "January 2009," Economic Indicators (January 2009) : 18-18. https://fraser.stlouisfed.org/title/1/item/609/toc/160838 , accessed on May 5, 2024.