United States. Bureau of Economic Analysis. "Gross Domestic Product: Second Quarter 2018 (Third Estimate) | Corporate Profits: Second Quarter 2018 (Revised Estimate) : Highlights: GDP Increases in Second Quarter, BEA 18-51,"
Bureau of Economic Analysis (BEA) News Releases
(September 27, 2018).
https://fraser.stlouisfed.org/title/6148/item/602659/content/pdf/bea_newsreleases_20180927_release-highlights, accessed on March 20, 2025.