United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : Third Quarter 1978," Productivity and Costs (November 29, 1978). https://fraser.stlouisfed.org/title/131/item/55885, accessed on April 23, 2024.
United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : Third Quarter 1978," Productivity and Costs (November 29, 1978). https://fraser.stlouisfed.org/title/131/item/55885, accessed on April 23, 2024.