United States. Bureau of Economic Analysis. "Gross Domestic Product: First Quarter 2007 (Preliminary)|Corporate Profits: First Quarter 2007 (Preliminary) : Technical Note, BEA 07-21,"
Bureau of Economic Analysis (BEA) News Releases
(May 31, 2007).
https://fraser.stlouisfed.org/title/6148/item/598962/content/pdf/bea_newsreleases_20070531_technical-note, accessed on July 9, 2025.