United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : Third Quarter 1977," Productivity and Costs (November 25, 1977). https://fraser.stlouisfed.org/title/131/item/55878, accessed on April 19, 2024.
United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : Third Quarter 1977," Productivity and Costs (November 25, 1977). https://fraser.stlouisfed.org/title/131/item/55878, accessed on April 19, 2024.