United States. Bureau of Economic Analysis. "Private Services-Producing Sector Continued to Lead Growth in 2006 : Revised Statistics of Gross Domestic Product by Industry, 2004-2006, BEA 08-02," Bureau of Economic Analysis (BEA) News Releases (January 29, 2008). https://fraser.stlouisfed.org/title/6148/item/600435, accessed on August 16, 2024.