United States. Bureau of Labor Statistics. "Footnotes," in United States. Bureau of Labor Statistics. "Revised First-Quarter [1986] Measures for Business, Nonfarm Business and Manufacturing and Preliminary Measures for Nonfinancial Corporations," Productivity and Costs (May 29, 1986) : 13-13. https://fraser.stlouisfed.org/title/131/item/55793/toc/447113 , accessed on April 24, 2024.