United States. Bureau of Labor Statistics. "Footnotes," in United States. Bureau of Labor Statistics. "Second Quarter 1984 : Business, Nonfarm Business, and Manufacturing Sectors," Productivity and Costs (July 31, 1984) : 10-10. https://fraser.stlouisfed.org/title/131/item/55782/toc/449817 , accessed on June 24, 2024.