United States. Bureau of Economic Analysis. "Gross National Product (GNP), Gross Domestic Product (GDP) : Revised Fourth Quarter 1976, BEA 77-13,"
Bureau of Economic Analysis (BEA) News Releases
(February 18, 1977).
https://fraser.stlouisfed.org/title/6148/item/595626, accessed on March 13, 2025.
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