United States. Bureau of Economic Analysis. "Gross Domestic Product: First Quarter 2015 (Advance Estimate) : Highlights: GDP Up Slightly in First Quarter, BEA 15-18,"
Bureau of Economic Analysis (BEA) News Releases
(April 29, 2015).
https://fraser.stlouisfed.org/title/6148/item/602236/content/pdf/bea_newsreleases_20150429_release-highlights, accessed on June 21, 2025.