United States. Bureau of Labor Statistics. "Summary of Revisions in Productivity and Costs," in United States. Bureau of Labor Statistics. "Productivity and Costs in the Private Economy, Second Quarter 1973 (and Data for Nonfinancial Corporations, First Quarter 1973)," Productivity and Costs (July 27, 1973) : 14-14. https://fraser.stlouisfed.org/title/131/item/55851/toc/494588 , accessed on May 2, 2024.