United States. Bureau of Economic Analysis. "Gross Domestic Product: Third Quarter 2009 (Advance Estimate) : Technical Note, BEA 09-47,"
Bureau of Economic Analysis (BEA) News Releases
(October 28, 2009).
https://fraser.stlouisfed.org/title/6148/item/600695/content/pdf/bea_newsreleases_20091028_technical-note, accessed on July 19, 2025.