United States. Bureau of Economic Analysis. "National Income and Product Accounts : 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, accessed on March 28, 2025.