United States. Bureau of Economic Analysis. "Gross Domestic Product: First Quarter 2016 (Advance Estimate) : Historical Comparisons, BEA 16-21,"
Bureau of Economic Analysis (BEA) News Releases
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https://fraser.stlouisfed.org/title/6148/item/602340/content/pdf/bea_newsreleases_20160428_historical-comparisons, accessed on June 12, 2025.