United States. Bureau of Economic Analysis. "Gross Domestic Product: Third Quarter 2013 (Second Estimate) | Corporate Profits: Third Quarter 2013 (Preliminary Estimate) : Historical Comparison, BEA 13-57," Bureau of Economic Analysis (BEA) News Releases (December 5, 2013). https://fraser.stlouisfed.org/title/6148/item/601580/content/pdf/bea_newsreleases_20131205_historical-comparisons, accessed on March 17, 2025.