United States. Bureau of Economic Analysis. "Gross Domestic Product: Fourth Quarter 2008 (Advance) : Highlights: Real GDP Declines 3.8 Percent in Fourth Quarter, BEA 09-02,"
Bureau of Economic Analysis (BEA) News Releases
(January 30, 2009).
https://fraser.stlouisfed.org/title/6148/item/600652/content/pdf/bea_newsreleases_20090130_release-highlights, accessed on July 14, 2025.