United States. Bureau of Labor Statistics. "Footnotes," in United States. Bureau of Labor Statistics. "Second Quarter 1994 [Revised] : Business, Nonfarm Business, Manufacturing, and Nonfinancial Corporations," Productivity and Costs (September 7, 1994) : 15-15. https://fraser.stlouisfed.org/title/131/item/55917/toc/486396 , accessed on May 8, 2024.