United States. Bureau of Labor Statistics. "Nonfarm Business Sector," in United States. Bureau of Labor Statistics. "Business, Nonfarm Business, and Manufacturing Sectors : Second Quarter 1982," Productivity and Costs (July 29, 1982) : 4-4. https://fraser.stlouisfed.org/title/131/item/55997/toc/438689 , accessed on April 25, 2024.