United States. Bureau of Economic Analysis. "Gross Domestic Product by Industry: Third Quarter 2017 : Full Release, BEA 18-02," Bureau of Economic Analysis (BEA) News Releases (January 19, 2018). https://fraser.stlouisfed.org/title/6148/item/602609/content/pdf/bea_newsreleases_20180119, accessed on March 17, 2025.