United States. Bureau of Economic Analysis. "First Quarter 1977 : Corporate Profits and National Income (Revised), GNP (Revised) and Gross Domestic Product, BEA 77-48," Bureau of Economic Analysis (BEA) News Releases (June 20, 1977). https://fraser.stlouisfed.org/title/6148/item/595662, accessed on August 16, 2024.