United States. Bureau of Labor Statistics. "Business Sector - Appendix - Quarterly Data," in United States. Bureau of Labor Statistics. "First Quarter 1992 [Revised] : Business, Nonfarm Business, Manufacturing, and Nonfinancial Corporations," Productivity and Costs (June 17, 1992) : 16-16. https://fraser.stlouisfed.org/title/131/item/55822/toc/464647 , accessed on March 29, 2024.