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 March 16, 2025.
@FedFRASER