United States. Bureau of Economic Analysis. "Gross Domestic Product: Fourth Quarter 2011 and Annual 2011 (Third Estimate) | Corporate Profits: Fourth Quarter 2011 and Annual 2011, BEA 12-11," Bureau of Economic Analysis (BEA) News Releases (March 29, 2012). https://fraser.stlouisfed.org/title/6148/item/601325, accessed on March 23, 2025.