United States. Bureau of Labor Statistics. "Nonfarm Business Sector - Appendix - Quarterly Data," in United States. Bureau of Labor Statistics. "First Quarter 1996 [Revised]," Productivity and Costs (June 18, 1996) : 14-14. https://fraser.stlouisfed.org/title/131/item/55920/toc/492612 , accessed on May 2, 2024.