United States. Bureau of Economic Analysis. "National Income and Product Accounts : Technical Note : Gross Domestic Product: Second Quarter 2013 (Advance Estimate) | Comprehensive Revision: 1929 Through First Quarter 2013, BEA 13-34,"
Bureau of Economic Analysis (BEA) News Releases
(July 31, 2013).
https://fraser.stlouisfed.org/title/6148/item/601557/content/pdf/bea_newsreleases_20130731_technical-note, accessed on July 14, 2025.