United States. Bureau of Economic Analysis. "Gross Domestic Product: Second Quarter 2009 (Third Estimate)|Corporate Profits: Second Quarter 2009 (Revised Estimate) : Technical Note, BEA 09-43,"
Bureau of Economic Analysis (BEA) News Releases
(September 30, 2009).
https://fraser.stlouisfed.org/title/6148/item/600691/content/pdf/bea_newsreleases_20090930_technical-note, accessed on June 17, 2025.