United States. Bureau of Economic Analysis. "Gross Domestic Product: First Quarter 2010 (Advance Estimate) : Technical Note, BEA 10-16," Bureau of Economic Analysis (BEA) News Releases (April 30, 2010). https://fraser.stlouisfed.org/title/6148/item/601148/content/pdf/bea_newsreleases_20100430_technical-note, accessed on March 16, 2025.