United States. Bureau of Economic Analysis. "National Income and Product Accounts : Full Release : Second Quarter 2006 GDP (Advance) | Revised Estimates: 2003 Through First Quarter 2006, BEA 06-33,"
Bureau of Economic Analysis (BEA) News Releases
(July 28, 2006).
https://fraser.stlouisfed.org/title/6148/item/598043/content/pdf/bea_newsrelease_20060728, accessed on July 18, 2025.