United States. Bureau of Economic Analysis. "Gross Domestic Product: First Quarter 2007 (Final)|Corporate Profits: First Quarter 2007 (Final), BEA 07-30,"
Bureau of Economic Analysis (BEA) News Releases
(June 28, 2007).
https://fraser.stlouisfed.org/title/6148/item/598971, accessed on July 9, 2025.