United States. Bureau of Economic Analysis. "Gross Domestic Product: First Quarter 2006 (Final) | Corporate Profits: First Quarter 2006 (Final) : Technical Note, BEA 06-30,"
Bureau of Economic Analysis (BEA) News Releases
(June 29, 2006).
https://fraser.stlouisfed.org/title/6148/item/598041/content/pdf/bea_newsreleases_20060629_technical-note, accessed on July 9, 2025.