United States. Bureau of Labor Statistics. "Nonfinancial Corporations," in United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : First Quarter 1982," Productivity and Costs (May 26, 1982) : 4-4. https://fraser.stlouisfed.org/title/131/item/55764/toc/438553 , accessed on May 1, 2024.