United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : Annual Data for 1979," Productivity and Costs (February 27, 1980). https://fraser.stlouisfed.org/title/131/item/55893, accessed on April 18, 2024.
United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : Annual Data for 1979," Productivity and Costs (February 27, 1980). https://fraser.stlouisfed.org/title/131/item/55893, accessed on April 18, 2024.