United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : First Quarter 1979," Productivity and Costs (May 29, 1979). https://fraser.stlouisfed.org/title/131/item/55886, accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : First Quarter 1979," Productivity and Costs (May 29, 1979). https://fraser.stlouisfed.org/title/131/item/55886, accessed on April 25, 2024.