United States. Bureau of Economic Analysis. "Gross Domestic Product: Second Quarter 2013 (Third Estimate) | Corporate Profits: Second Quarter 2013 (Revised Estimate) : Technical Note, BEA 13-46,"
Bureau of Economic Analysis (BEA) News Releases
(September 26, 2013).
https://fraser.stlouisfed.org/title/6148/item/601569/content/pdf/bea_newsreleases_20130926_technical-note, accessed on June 22, 2025.