United States. Bureau of Economic Analysis. "Gross Domestic Product and Corporate Profits: Fourth Quarter 2007 (Final)|Corporate Profits: Fourth Quarter 2007 : Full Release, BEA 08-12," Bureau of Economic Analysis (BEA) News Releases (March 27, 2008). https://fraser.stlouisfed.org/title/6148/item/600445/content/pdf/bea_newsreleases_20080327, accessed on March 21, 2025.