United States. Bureau of Economic Analysis. "Gross Domestic Product: Fourth Quarter (Second Estimate) : Technical Note, BEA 16-08," Bureau of Economic Analysis (BEA) News Releases (February 26, 2016). https://fraser.stlouisfed.org/title/6148/item/602328/content/pdf/bea_newsreleases_20160226_a_technical-note, accessed on March 18, 2025.