United States. Bureau of Economic Analysis. "National Income and Product Accounts : Technical Note : Gross Domestic Product: Second Quarter 2011 (Advance Estimate) | Revised Estimates: 2003 Through First Quarter 2011, BEA 11-38," Bureau of Economic Analysis (BEA) News Releases (July 29, 2011). https://fraser.stlouisfed.org/title/6148/item/604098/content/pdf/bea_newsreleases_20110729_technical-note, accessed on March 22, 2025.