United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : Second Quarter 1978," Productivity and Costs (August 28, 1978). https://fraser.stlouisfed.org/title/131/item/55883, accessed on April 25, 2024.
United States. Bureau of Labor Statistics. "Nonfinancial Corporate Sector : Second Quarter 1978," Productivity and Costs (August 28, 1978). https://fraser.stlouisfed.org/title/131/item/55883, accessed on April 25, 2024.