United States. Bureau of Economic Analysis. "Gross Domestic Product: Fourth Quarter and Annual 2016 (Second Estimate) : Technical Note, BEA 17-07," Bureau of Economic Analysis (BEA) News Releases (February 28, 2017). https://fraser.stlouisfed.org/title/6148/item/602478/content/pdf/bea_newsreleases_20170228_technical-note, accessed on March 17, 2025.