United States. Bureau of Economic Analysis. "Gross Domestic Product: Fourth Quarter 2006 (Final)|Corporate Profits: Fourth Quarter 2006 : Highlights: GDP Grew 2.5 Percent in the Fourth Quarter, BEA 07-12,"
Bureau of Economic Analysis (BEA) News Releases
(March 29, 2007).
https://fraser.stlouisfed.org/title/6148/item/598953/content/pdf/bea_newsreleases_20070329_highlights, accessed on July 11, 2025.