United States. Bureau of Economic Analysis. "Gross National Product (GNP), Gross Domestic Product (GDP) : Preliminary Fourth Quarter and Year 1976, BEA 77-05,"
Bureau of Economic Analysis (BEA) News Releases
(January 18, 1977).
https://fraser.stlouisfed.org/title/6148/item/595615, accessed on March 22, 2025.
@FedFRASER