United States. Bureau of Economic Analysis. "Fourth Quarter 1977 : GNP and Gross Domestic Product (Revised), Corporate Profits (Preliminary), BEA 78-19,"
Bureau of Economic Analysis (BEA) News Releases
(March 20, 1978).
https://fraser.stlouisfed.org/title/6148/item/595734, accessed on March 22, 2025.
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