United States. Bureau of Economic Analysis. "Personal Income and Outlays, December 2018 | Personal Income, January 2019 : Historical Comparison, BEA 19-06," Bureau of Economic Analysis (BEA) News Releases (February 19, 2019). https://fraser.stlouisfed.org/title/6148/item/602776/content/pdf/bea_newsreleases_20190219_historical-comparison, accessed on March 24, 2025.