United States. Bureau of Economic Analysis. "Gross Domestic Product: Third Quarter 2013 (Advance Estimate) : Technical Note, BEA 13-50," Bureau of Economic Analysis (BEA) News Releases (November 7, 2013). https://fraser.stlouisfed.org/title/6148/item/601573/content/pdf/bea_newsreleases_20131107_technical-note, accessed on March 17, 2025.