United States. Bureau of Economic Analysis. "Gross Domestic Product: Second Quarter 2008 (Final)|Corporate Profits: Second Quarter 2008 (Final) : Technical Note, BEA 08-45," Bureau of Economic Analysis (BEA) News Releases (September 26, 2008). https://fraser.stlouisfed.org/title/6148/item/600476/content/pdf/bea_newsreleases_20080926_technical-note, accessed on March 21, 2025.