United States. Bureau of Economic Analysis. "Gross Domestic Product: Second Quarter 2006 (Preliminary) | Corporate Profits: Second Quarter 2006 (Preliminary) : Technical Note, BEA 06-36,"
Bureau of Economic Analysis (BEA) News Releases
(August 30, 2006).
https://fraser.stlouisfed.org/title/6148/item/598046/content/pdf/bea_newsreleases_20060830_technical-note, accessed on March 26, 2025.