United States. Bureau of Labor Statistics. "Nonfarm Business Sector," in United States. Bureau of Labor Statistics. "First Quarter 1994 [Revised] : Business, Nonfarm Business, Manufacturing, and Nonfinancial Corporations," Productivity and Costs (June 15, 1994) : 12-12. https://fraser.stlouisfed.org/title/131/item/55838/toc/485307 , accessed on June 15, 2024.