United States. Bureau of Economic Analysis. "Gross Domestic Product: Fourth Quarter and Annual 2015 (Advance Estimate) : Highlights: GDP Increases in Fourth Quarter, BEA 16-04,"
Bureau of Economic Analysis (BEA) News Releases
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https://fraser.stlouisfed.org/title/6148/item/602323/content/pdf/bea_newsreleases_20160129_release-highlights, accessed on July 7, 2025.