United States. Bureau of Economic Analysis. "First Quarter 1978 : GNP and Gross Domestic Product (Revised), Corporate Profits (Preliminary), BEA 78-37,"
Bureau of Economic Analysis (BEA) News Releases
(May 18, 1978).
https://fraser.stlouisfed.org/title/6148/item/595752, accessed on March 20, 2025.
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